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
Muirne	-	Irish Mythology
Bogdan	BAWG-dahn (Polish), BOG-dahn (Serbian, Croatian), bog-DAHN (Romanian)	Polish, Russian, Slovene, Bulgarian, Serbian, Croatian, Macedonian, Romanian, Medieval Slavic
Domnall	-	Scottish, Irish
Dermot	-	Irish
Merab (1)	-	Biblical
DobrosŁAw	daw-BRAW-swahf	Polish