/mug"inz/ , n.
1. a convention in the card game of cribbage in which a player scores points overlooked by an opponent.
2. a game of dominoes, in which any player who can make the sum of two ends of the line equal five or a multiple of five adds the number so made to his or her score.
3. Brit. Slang. a fool.
[ 1850-55; prob. special use of proper name; def. 3 by assoc. with MUG ]