to make a sharp noise by moving your second or third finger quickly against your thumb, to attract somebody’s attention, or to mark the beat of music, for example打榧子,彈指頭(撚拇指作響)
He snapped his fingers for the waiter to bring more wine.他啪的一聲讓服務員多拿些酒來。
He snapped his fingers and the waiter came running.他打了個響指,服務生快步走來。