Twibill

Noun

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. A mattock with one blade like an axe and the other like an adze.
3. A reaping hook, especially for cutting beans and peas.
4. A double-bladed halberd or battle-axe.