Nicker \Nick"er\, n. [From Nick, v. t.]

1. One of the night brawlers of London formerly noted for breaking windows with half-pence. [Cant] --Arbuthnot.

2. The cutting lip which projects downward at the edge of a boring bit and cuts a circular groove in the wood to limit the size of the hole that is bored.

Source: Webster's Revised Unabridged Dictionary (1913)