'Nicker' definitions:

Definition of 'nicker'

noun

The characteristic sounds made by a horse [syn: neigh, nicker, whicker, whinny]

verb

Make a characteristic sound, of a horse [syn: neigh, nicker, whicker, whinny]

From: GCIDE

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]