a short piece of wood, plastic, etc. that is put through a loop of thread to fasten something, such as a coat or bag, instead of a button (大衣或口袋等上木质或塑料的)栓扣钉,棒形纽扣,套索扣 Topics Clothes and Fashionc2- (also toggle switch)(
computing )计算机 a key on a computer that you press to change from one style or operation to another, and back again Topics Computersc2转换键;切换键
Word Originmid 18th cent. (originally in nautical use): of unknown origin.