警棍
Billy \Bil"ly\, n. 1. A club; esp., a policeman's club. 2. (Wool Manuf.) A slubbing or roving machine.
billy n 1: a short stout club used primarily by policemen [syn: {truncheon}, {nightstick}, {billystick}, {billy club}] 2: male goat [syn: {billy goat}, {he-goat}]