twibill

noun4

1. •
   A two-edged tool used in gate-type hurdle-making for cutting out mortises, with a flat chisel and a mortise chisel or hook, similar to the much larger French carpenter's tool, the besaiguë (or bisaiguë).
2. •
   (dialect, UK) A mattock with one blade like an axe and the other like an adze.
3. •
   (dialect) A reaping hook, especially for cutting beans and peas.
4. •
   (no longer used) A double-bladed halberd or battle-axe.

   • [A] little fair-haired man, as broad as he was tall, who heaved up a long “twybill,” or double axe. — 1866