gaffes1) N-COUNT A gaffe is a stupid or careless mistake, for example when you say or do something that offends or upsets people.
He made an embarrassing gaffe at the convention last weekend.
...social gaffes committed by high-ranking individuals.Syn:2) PHRASE: V inflects If you blow the gaffe or blow the gaff, you tell someone something that other people wanted you to keep secret. [BRIT, INFORMAL]Syn:let slip
English dictionary. 2008.