the world > physical sensation > hearing and noise > degree, kind, or quality of sound > sharp or hard sound > [verb (intransitive)] > crack or snap > of fingers (3)
thrip1594
intransitive. To make a noise with thumb and finger which resembles the whispering of ‘thrip’ or ‘flip’; transitive to snap (the fingers). Obsolete.
lirp1598
A snap (of the fingers).
knick1887
transitive and intransitive. To snap, or crack lightly (the fingers, etc.); to ‘knack’ lightly.