noun British Informal.
a horse chestnut.
the hollowed-out shell of a horse chestnut.
conkers, a game in which a child swings a horse chestnut on a string in an attempt to break that of another player.
Origin of conker
1840–50; probably orig. conquer; compare conquering a game played with snail shells (the name of the game presumably later transferred to the playing pieces)
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019
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Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
"snail shell," also "horse chestnut," from children's game of conkers (q.v.).
Online Etymology Dictionary, © 2010 Douglas Harper