twibill

Etymology
From, from , from + , see also.

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  (or ).
 * 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.