Definition of wimp out phrasal verb from the Oxford Advanced Learner's Dictionary

 

wimp out

 phrasal verb
phrasal verb Fear
 
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Phrasal Verbs

wimp out (of something)

 
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(informal, disapproving) to not do something that you intended to do because you are too frightened or not confident enough to do it See related entries: Fear
See the Oxford Advanced American Dictionary entry: wimp out