The rule: when over-, under-, out-, or up- begins a verb, the main stress falls on the root: overCOME, underSTAND, outRUN, upSET. When the same kind of word is a noun, the main stress moves to the prefix: OVERtime, UNDERwear, OUTcome, UPdate.
This one pattern covers dozens of everyday words, and it explains why the same spelling can have two different stress patterns. A driver who overlooks a stop sign (overLOOK) is doing something very different from a tourist who parks at a scenic overlook (OVERlook). Once you understand the logic, you can predict the stress of words you have never heard before.
The Rule in Short
- Verbs: primary stress on the root, secondary stress on the prefix. Example: understand /ˌʌndɚˈstænd/.
- Nouns: primary stress on the prefix, secondary stress on the root. Example: outcome /ˈaʊtˌkʌm/.
- The prefix vowel never reduces. Over is always /oʊvɚ/, under is /ʌndɚ/, out is /aʊt/, up is /ʌp/. Only the level of stress changes, never the vowel quality.
Why It Works: The Logic Behind the Stress
Over, under, out, and up are not Latin prefixes like pre- or con-. They are ordinary English words (adverbs and prepositions, often called particles) that have fused with another word. When two English words fuse, the stress of the new word depends mostly on its part of speech.
Verbs keep the beat on the action
In a verb like overcome, the core action is come. The prefix adds an idea (too much, beyond, better than, below), but the verb is still built around its root, so the root carries the main beat: to overCOME, to outRUN, to underEStimate. The prefix is not weak, though. It keeps a clear secondary stress, which is why you hear a full /oʊ/ at the start of overcome and not a quick schwa.
Nouns behave like compound nouns
Nouns such as overtime, outcome, and underwear are built like compound nouns, and English compound nouns put the main stress on the first part: GREENhouse, BLACKboard, OUTcome. If you already know the compound noun rule, you already know half of this pattern.
The same front vs. back tendency as other noun/verb pairs
The result mirrors the famous pattern in pairs like a REcord / to reCORD and a PREsent / to preSENT: nouns lean toward the front of the word, verbs lean toward the back. The noun-verb stress shift guide covers the Latin-based version of this idea, and the con- and com- prefix guide shows how that same shift changes vowels in words like CONtract and conTRACT.
Pattern Examples
Verbs: stress the root
| Verb | US IPA | Stress | Meaning |
|---|---|---|---|
| overcome | /ˌoʊvɚˈkʌm/ | over-COME | to defeat, get past |
| overlook | /ˌoʊvɚˈlʊk/ | over-LOOK | to fail to notice |
| oversleep | /ˌoʊvɚˈslip/ | over-SLEEP | to sleep too long |
| overreact | /ˌoʊvɚriˈækt/ | over-re-ACT | to react too strongly |
| understand | /ˌʌndɚˈstænd/ | under-STAND | to know the meaning |
| underestimate | /ˌʌndɚˈɛstəˌmeɪt/ | under-ES-ti-mate | to judge as too small |
| undergo | /ˌʌndɚˈɡoʊ/ | under-GO | to experience (a process) |
| outrun | /ˌaʊtˈrʌn/ | out-RUN | to run faster than |
| outgrow | /ˌaʊtˈɡroʊ/ | out-GROW | to become too big for |
| outnumber | /ˌaʊtˈnʌmbɚ/ | out-NUM-ber | to be more than |
| uphold | /ʌpˈhoʊld/ | up-HOLD | to support, maintain |
Nouns: stress the prefix
| Noun | US IPA | Stress | Meaning |
|---|---|---|---|
| overtime | /ˈoʊvɚˌtaɪm/ | OVER-time | extra work hours |
| overview | /ˈoʊvɚˌvju/ | OVER-view | general summary |
| underwear | /ˈʌndɚˌwɛr/ | UNDER-wear | clothes worn under clothes |
| underdog | /ˈʌndɚˌdɔɡ/ | UNDER-dog | the side expected to lose |
| outcome | /ˈaʊtˌkʌm/ | OUT-come | final result |
| output | /ˈaʊtˌpʊt/ | OUT-put | amount produced |
| outlook | /ˈaʊtˌlʊk/ | OUT-look | view of the future |
| outbreak | /ˈaʊtˌbreɪk/ | OUT-break | sudden start (of disease, war) |
Same spelling, different stress
These pairs are where the rule really pays off. The spelling is identical; only the stress tells the listener whether you mean the thing or the action.
| Word | Noun (stress prefix) | Verb (stress root) | Meaning |
|---|---|---|---|
| overlook | /ˈoʊvɚˌlʊk/ | /ˌoʊvɚˈlʊk/ | a scenic viewpoint / to fail to notice |
| overflow | /ˈoʊvɚˌfloʊ/ | /ˌoʊvɚˈfloʊ/ | extra that spills over / to spill over the top |
| overlap | /ˈoʊvɚˌlæp/ | /ˌoʊvɚˈlæp/ | a shared area / to partly cover |
| overcharge | /ˈoʊvɚˌtʃɑrdʒ/ | /ˌoʊvɚˈtʃɑrdʒ/ | an extra charge / to charge too much |
| overhaul | /ˈoʊvɚˌhɔl/ | /ˌoʊvɚˈhɔl/ | a complete repair / to repair or reform completely |
| overthrow | /ˈoʊvɚˌθroʊ/ | /ˌoʊvɚˈθroʊ/ | a removal from power / to remove from power |
| upset | /ˈʌpˌsɛt/ | /ʌpˈsɛt/ | a surprise defeat / to make unhappy, knock over |
| update | /ˈʌpˌdeɪt/ | /ʌpˈdeɪt/ | new information / to make current |
| upgrade | /ˈʌpˌɡreɪd/ | /ʌpˈɡreɪd/ | an improved version / to improve |
Listen to the difference in a sentence: The team pulled off a huge UPset. vs. That news will upSET her. Note that the adjective upset (I'm upset) follows the verb: /ʌpˈsɛt/.
The phrasal verb connection
Many of these words have a phrasal verb cousin, and each of the three forms has its own stress:
- take over (phrasal verb): take Over /ˌteɪk ˈoʊvɚ/, stress on the particle
- a takeover (noun): TAKEover /ˈteɪkˌoʊvɚ/, stress on the first part
- to overtake (verb with prefix): overTAKE /ˌoʊvɚˈteɪk/, stress on the root
The same logic applies to look over (to examine: look Over), to overlook (overLOOK), and an overlook (OVERlook); to set up (set UP) and a setup (SETup /ˈsɛt̬ˌʌp/); and to break out (break OUT) and an outbreak (OUTbreak). Notice that the meanings are not always the same across the three forms: look over means to check, but overlook means to miss. For more on the first form, see the phrasal verb stress rule.
Adjectives and Participles
Adjectives with these prefixes usually stress the second part when they stand alone: overdue /ˌoʊvɚˈdu/, underpaid /ˌʌndɚˈpeɪd/, outdated /ˌaʊtˈdeɪt̬ɪd/, overweight /ˌoʊvɚˈweɪt/, upstairs /ˌʌpˈstɛrz/. The rent is overDUE. The workers are underPAID.
Before a noun, the stress often moves forward to keep a natural rhythm and avoid two strong beats in a row: an Overdue BILL, an OUTdated PHONE, the UPstairs ROOM. This shift is common but not automatic, and speakers vary, so treat it as a tendency rather than a strict rule.
Exceptions and How to Spot Them
1. Verbs that came from nouns
Some verbs were created from an existing noun, and they keep the noun's stress. The test: if the verb means "to make or do the noun," the noun probably came first.
- to outline /ˈaʊtˌlaɪn/ (to make an outline): OUTline the plan
- to outlaw /ˈaʊtˌlɔ/ (to make something illegal): OUTlaw a product
- to underline, usually /ˈʌndɚˌlaɪn/ (to draw a line under): UNderline the title, although some speakers say underLINE
- to overdose /ˈoʊvɚˌdoʊs/ (to take an overdose): stress on over, like the noun
2. Update and upgrade as verbs
The traditional verb stress is upDATE /ʌpˈdeɪt/ and upGRADE /ʌpˈɡreɪd/. However, many Americans also say UPdate for the verb, especially in tech talk (I need to UPdate my phone). Both are heard and both are understood. If you want the safest choice, use root stress for the verb and prefix stress for the noun.
3. Dictionaries sometimes list both
For a few words (overflow, overlap), you will hear some variation even among native speakers. The noun/verb contrast is strongest and most reliable in common pairs like overlook, upset, overhaul, and overthrow.
Common Mistakes Learners Make
- Stressing the prefix on verbs. Saying I UNderstand is one of the most noticeable stress errors in English. Native speakers say underSTAND. The same goes for Overcome and OUTrun as verbs.
- Giving every syllable equal weight. Spanish and Portuguese speakers often pronounce over-come with two equal beats. English needs a clear contrast: one strong beat, one medium beat.
- Stressing the end of every word. French speakers tend to put the beat at the end. That happens to work for verbs (overCOME) but sounds wrong for nouns: say OUTcome, not outCOME.
- Reducing the prefix vowel. Do not turn over- into a quick "uh-ver." The /oʊ/ in overcome stays a full diphthong even though it is not the main stress.
- Treating the pairs as one word. An OVERlook and to overLOOK are different words for native listeners. Using the wrong one can confuse or amuse them.
German speakers have a helpful parallel. German distinguishes überSETzen (to translate, stress on the root) from Übersetzen (to ferry across, stress on the prefix), and überSEhen (to overlook) has root stress, just like English overLOOK. German nouns like Überblick (overview) also stress the prefix, just like English OVERview.
Practice
Word cards
The first four words are verbs (stress the root); the last four are nouns (stress the prefix). Listen, then record yourself.
Sentences
Read each sentence aloud. Capital letters show the main stress of the target words.
- We stopped at the OVERlook, but I overLOOKED the sign for the exit.
- If you overSLEEP again, you will have to work OVERtime.
- Our team was the UNderdog, but we outPLAYED them. What an UPset!
- Don't overreACT; the OUTcome is not final yet.
- The app will upDATE tonight, and the UPdate fixes the bug.
- After the TAKEover, a new CEO will take Over.
- I underSTAND the Overview, but I underEStimated the details.
- The new rules will overHAUL the system; it needs a complete Overhaul.
Quick Summary
- Verb with over-, under-, out-, up-: stress the root (underSTAND, outNUMber).
- Noun with the same prefixes: stress the prefix (OUTcome, OVERtime).
- Same spelling, two meanings: let stress show the part of speech (UPset vs. upSET).
- The prefix keeps its full vowel: /oʊvɚ/, /ʌndɚ/, /aʊt/, /ʌp/. No schwa.
- Adjectives stress the second part alone (overDUE) but often shift forward before a noun.
- Verbs made from nouns keep noun stress (OUTline, OUTlaw), and some Americans say UPdate for the verb.