- a playing marble, especially one that is not used as a shooter.
- mibs, (used with a singular verb) the game of marbles.
Origin of mib
1890–95, Americanism; shortened variant of marble
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
Examples from the Web for mib
MIB: His excellent taste in sneakers and child-like enthusiasm for his Kindle.TV's Funniest Frenemies
July 14, 2009