undergo

verb

un·​der·​go ˌən-dər-ˈgō 

underwent ˌən-dər-ˈwent  ; undergone ˌən-dər-ˈgȯn 

also -ˈgän

; undergoing ˌən-dər-ˈgō-iŋ 

-ˈgȯ(-)iŋ

; undergoes

ˌən-dər-ˈgōz

transitive verb

1

: to submit to : endure

2

: to go through : experience

undergo a transformation

3

obsolete : undertake

4

obsolete : to partake of

Synonyms of undergo

• endure
• experience
• have
• see

Examples of undergo in a Sentence

She will have to undergo an operation.

some people undergo a complete transformation while away at college

Recent Examples on the Web

The 31-year-old Buehler, once one of the top pitchers in the National League, has not been near the same pitcher since undergoing a second Tommy John surgery and missing the 2023 season. —Kevin Acee, San Diego Union-Tribune, 17 Feb. 2026

When enriched uranium undergoes nuclear fission, efficiencies are much higher. —Big Think, 16 Feb. 2026

The teenager was undergoing cancer treatment and had been home visiting her family for the weekend when her father, Ruben Torres Maldonado, was arrested in October 2025 at a Home Depot store in suburban Chicago, a GoFundMe page set up for the family states. —Thao Nguyen, USA Today, 16 Feb. 2026

But in the off-season, O’Shea underwent foot surgery that required two plates and 11 screws to repair the damage. —Scott M. Reid, Oc Register, 16 Feb. 2026

Word History

First Known Use

14th century, in the meaning defined at sense 1

Rhymes for undergo

• afterglow
• akimbo
• albino
• aliquot
• allegro
• amigo
• apropos
• audio
• bungalow
• calico
• calypso
• cameo

Kids Definition

undergo

verb

un·​der·​go ˌən-dər-ˈgō 

underwent

-ˈwent

; undergone -ˈgȯn 

also -ˈgän

; undergoing -ˈgō-iŋ 

1

: endure sense 2

undergo an operation

2

: to pass through : experience

undergoing a change