blow the gaff

(British old-fashioned, informal)

to cause trouble for someone by letting other people know something that they were trying to keep secret (often + on ) They killed Green because he was about to blow the gaff on their drug dealing.

Common Names:

Name	Pronounced	Usage
Pernilla	-	Swedish
Filiberto	-	Italian
Ermo	-	Medieval Italian
Sergey	syer-GYAY (Russian), seer-GYAY (Russian)	Russian, Bulgarian
Etzel	-	Germanic Mythology
Woo-Jin	oo-jeen	Korean