gaff

gaff /ˈgæf/ noun
plural gaffs
gaff
/ˈgæf/
noun
plural gaffs
Britannica Dictionary definition of GAFF
[count]
1 
: a spear or hook used for lifting heavy fish
2 
: a pole that supports the top of a sail on some sailboats
3 
British slang : someone's home

blow the gaff

British slang
: to reveal a secret especially in a public way — usually + on