Trepan

trepan, n.1
1. An instrument for cutting out small pieces of bone, especially from the skull.
2. A military engine formerly used for boring holes in walls.
3. An instrument for sinking shafts.
4. A hole made in a bone by a trepan

trepan, v.1
a. To saw through a bone of the skull with a trepan.
b. In brush-making: see trepanning
c. To cut a hole in something, with the core removed as a solid piece.

trepan, trapan, n.2
[A word of obscure and low origin, prob. originally a term of thieves' or rogues' slang.]
1. A person who entraps or decoys others.
2. A stratagem, trick, trap or snare.

trepan, trapan, v.2
a. To entrap, ensnare, beguile.
b. To lure, inveigle.
c. To do by craft or guile; to cheat or beguile out of; to swindle.