expression, godan verb (-su)
snap one's fingers
The action of making a snapping sound with one's fingers, often to get attention or to a rhythm.
彼は店員を呼ぶために指を鳴らした。
He snapped his fingers to call the waiter.
expression, godan verb (-su)
crack one's knuckles; pop one's fingers
Refers to cracking or popping the joints of the fingers, often as a habit or to relieve stiffness.
彼は考え事をしながら指を鳴らす癖がある。
He has a habit of cracking his knuckles while thinking.