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fess up

B1 informal intransitive

To admit or confess to something, especially something you have done wrong or have been trying to hide.

In plain English

To tell the truth and say you did something wrong after trying to hide it.

What does "fess up" mean?

2 meanings, ordered from most common to least. Color-coded by CEFR level.

1 B1 idiomatic informal

To confess or admit to doing something wrong, especially after initially denying or hiding it.

"Come on, just fess up — who ate the last slice of cake?"

It's time to fess up to your mistakes.

— Common colloquial expression; widely used in American media.
2 B1 idiomatic informal

To reveal a secret or hidden information about oneself, often under pressure.

"After three hours of questioning, he finally fessed up about where the money had gone."

Usage tip

Chiefly American English, though understood in British English. Very informal and conversational. Often used in a light-hearted or humorous tone for minor confessions, as well as for more serious ones. Frequently followed by 'to + noun/gerund': 'fess up to taking the cookie'.

Words that pair with "fess up"

Natural word combinations native speakers use most often.

mistake lie truth secret cheating blunder

How to conjugate "fess up"

The five tense forms you'll use most often.

Base
fess up
I/you/we/they
3rd person
fesses up
he/she/it
Past simple
fessed up
yesterday
Past participle
fessed up
have + pp
-ing form
fessing up
continuous

Hear "fess up" in the wild

Listen to native speakers using "fess up" in real YouTube videos — click a clip to watch it on Looplines.

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