Meaning of “fess up” in the English Dictionary

british dictionary

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

"fess up" in American English

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fess up

infml
phrasal verb with fess /fes/ verb

to tell the truth or say that you are responsible; confess:

How can we force the president to fess up and accept responsibility for his behavior?

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