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English definition of “fess up”

fess up

informal
verb uk phrasal verb with fess   /fes/ us  
to admit that you have done something that someone else will not like: Fess up - it was you who ate that last piece of cake, wasn't it?Admitting and confessing
(Definition of fess up from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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