[dime] n [ME, tenth part, tithe, fr. MF, fr. L decima, fr. fem. of decimus tenth, fr. decem ten--more at ten] (1786) 1 a: a coin of the U.S. worth 1/10 dollar b: a petty sum of money
2: a Canadian 10-cent piece -- a dime a dozen : so plentiful or commonplace as to be of little esteem or slight value -- on a dime 1: in a very small area "these cars can turn on a dime"
2: instantly