snap one's fingers

snap one's fingers (third-person singular simple present snaps one's fingers, present participle snapping one's fingers, simple past and past participle snapped one's fingers)

1. To create a cracking or clicking sound with one’s fingers by building tension between the thumb and another finger (middle, index, or ring) and then moving that finger forcefully downward so it hits the thenar eminence of the same hand at a high speed.