billhook

Short definition from Wiktionary

Noun

1. 1
   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. 2
   An agricultural hand tool often with a curved or hooked end to the blade used for pruning or cutting thick, woody plants.
3. 3
   A part of the knotting mechanism in a reaper-binder or baler (agricultural machinery).
4. 4
   Rare form of bill hook (“spiked hook used in shops for hanging papers”).
5. 5
   Rare form of bill hook (“sharply pointed spike on honeyguide hatchlings' mandibles”).

Verb

1. 1
   To use a billhook.