Definition of “stand up” - English Dictionary

“stand up” in British English

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stand-upadjective

uk /ˈstænd.ʌp/ us /ˈstænd.ʌp/

stand-upnoun

uk /ˈstænd.ʌp/ us /ˈstænd.ʌp/

(Definition of “stand up” from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)

“stand up” in American English

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stand up

phrasal verb with stand us /stænd/ verb past tense and past participle stood /stʊd/

(PROVE TRUE)

to prove to be true when closely examined:

The evidence is weak and will not stand up in court.
Good research will stand up under any criticism.

To stand up also means to continue to be strong even after receiving severe treatment:

This fabric will stand up well even if it gets lots of wear.

stand-upadjective [ not gradable ]

us /ˈstændˌʌp/

related to a type of performance in which someone stands in front of a group of people and tells jokes:

stand-up comedy
standup
noun [ U ] us /ˈstæn·dʌp/

She doesn’t do a lot of standup anymore.

(Definition of “stand up” from the Cambridge Academic Content Dictionary © Cambridge University Press)