also gaff
(~s)
1.
A ~ is a stupid or careless mistake, for example when you say or do something that offends or upsets people.
He made an embarrassing ~ at the convention last weekend.
...social ~s committed by high-ranking individuals.
= blunder
N-COUNT
2.
If you blow the ~ or blow the gaff, you tell someone something that other people wanted you to keep secret. (BRIT INFORMAL)
PHRASE: V inflects