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From The Collaborative International Dictionary of English v.0.48:
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. [1913 Webster] 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. [1913 Webster]