Fess-up meaning

fes
Fess up is defined as to confess to something, take responsibility for something or tell the truth about something.

An example of fess up is when you tell your friend how much you lost in Vegas.

An example of fess up is when you admit to your friend you lost the sweater she lent you.

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To admit or acknowledge something; confess.
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(intransitive, slang) To confess to something; to admit something.
verb
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Alternative form of fess up.
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Origin of fess-up

Aphetic form of confess + up.