an iron hook with a handle for landing large fish.
2.
the spur on a climbing iron, especially as used by telephone linemen.
3.
Nautical. a spar rising aft from a mast to support the head of a quadrilateral fore-and-aft sail (gaff sail).
4.
a metal spur for a gamecock.
verb (used with object)
5.
to hook or land (a fish) with a gaff.
Origin: 1275–1325; Middle English < Middle French gaffe, gaff < Provençal gaf hook, gaff, noun derivative of gafar to seize (compare Medieval Latin gaffare), probably < Germanic (Visigothic) *gaff-, perhaps derivative from base of Gothic gibangive