underwent

UK: /ˌʌndəˈwɛnt/ US: (un′dər went′)

From the verb undergo: (⇒ conjugate)

underwent is: ⓘ

v past

WordReference Random House Unabridged Dictionary of American English © 2026

un•der•went  (un′dər went′), v. 

1. pt. of undergo. 

Collins Concise English Dictionary © HarperCollins Publishers::

underwent / ˌʌndəˈwɛnt/ verb

1. the past tense of undergo

WordReference Random House Learner's Dictionary of American English © 2026

un•der•go /ˌʌndɚˈgoʊ/   v. [~ + object] , -went, -gone, -go•ing. 

1. to be subjected to;
   to be put through;
   to experience:
   has undergone surgery.
2. to suffer through;
   endure or sustain:
   For years they underwent starvation.

WordReference Random House Unabridged Dictionary of American English © 2026

un•der•go  (un′dər gō′), v.t., -went, -gone, -go•ing. 

1. to be subjected to;
   experience;
   pass through:
   to undergo surgery.
2. to endure;
   sustain;
   suffer:
   to undergo sustained deprivation.

• Middle English undergon, Old English undergān. See under-, go¹ bef. 1000

un′der•go′er, n. 
Synonyms

• 1. See experience. 
• 2. bear, tolerate.

Antonyms

• 1. avoid.

Collins Concise English Dictionary © HarperCollins Publishers::

undergo / ˌʌndəˈɡəʊ/ verb ( -goes, -going, -went, -gone)

1. (transitive) to experience, endure, or sustain: to undergo a dramatic change of feelings

Etymology: Old English: earlier meanings were more closely linked with the senses of under and go

ˈunderˌgoer noun