Etymology Earliest use in weapon (and later, agricultural) sense, bill (“a bladed pike (obsolete)”) + hook; other senses formed anew from various meanings of bill.
1
Engineering, Government, Military, Natural sciences, Physical sciences, Politics, Tools, War, Weaponry A medieval polearm, fitted to a long handle, sometimes with an L-shaped tine or a spike protruding from the side or the end of the blade for tackling the opponent; a bill.
2
An agricultural hand tool often with a curved or hooked end to the blade used for pruning or cutting thick, woody plants.
I worked very hard in the copse of young ash, with my billhook and a shearing-knife; cutting out the saplings where they stooled too close together, making spars to keep for thatching, wall-crooks to drive into the cob, stiles for close sheep hurdles, and handles for rakes, and hoes, and two-bills, of the larger and straighter stuff.1869, Richard D. Blackmore, Lorna Doone, chapter 38:
With a small billhook he carefully freed the collar of the tree from twigs and patches of moss which incrusted it to a height of a foot or two above the ground, an operation comparable to the "little toilet" of the executioner's victim.1886 May – 1887 April, Thomas Hardy, “chapter 19”, in The Woodlanders […], volume (please specify |volume=I to III), London; New York, N.Y.: Macmillan and Co., published 1887, →OCLC:
3
Literary, Often, As bill-hook A part of the knotting mechanism in a reaper-binder or baler (agricultural machinery).
4
Rare Rare form of bill hook (“spiked hook used in shops for hanging papers”).
5
Rare Rare form of bill hook (“sharply pointed spike on honeyguide hatchlings' mandibles”).
Etymology Earliest use in weapon (and later, agricultural) sense, bill (“a bladed pike (obsolete)”) + hook; other senses formed anew from various meanings of bill.
1
To use a billhook.
Toward the end of July, Vatanen took a forestry job. It meant billhooking and chopping excessive undergrowth from the woods on the sandy ridges around Kuhmo and living in a tent with an ever more faithful, almost full- grown hare.2010, Arto Paasilinna, The Year of the Hare: A Novel: