Other forms: gaffs
A gaff is a hooked pole for landing a large fish. Reach with the gaff.
It is used only for fish being kept, since it does real damage. To blow the gaff is a separate phrase and means giving a secret away.
1noungaffA hooked pole for landing a large fish.
“The gaff was over the side before the fish was anywhere near the boat.”
gaff is a tool.
Old French gaffe comes from Occitan gaf, a hook, from gafar, to seize.
Old Occitan
gaf — hook
Old French
gaffe
Middle English
gaffe
English, today
gaff
Built from
From Middle English gaffe, from Old French gaffe, from Old Occitan gaf (“hook”), derivative of gafar (“to seize”), from 𐌲𐌹𐌱𐌰𐌽 (“to give”). a doublet of gaffe. underwear apparently derives from the idea that the garment tricks or deceives others about the wearer's genitalia.
Etymology from Wiktionary, CC BY-SA