Noun

1. A short light metallic sound
2. A stop consonant made by the suction of air into the mouth (as in bantu)
3. A hinged catch that fits into a notch of a ratchet to move a wheel forward or prevent it from moving backward
4. Depression of a button on a computer mouse

Verb

1. Move or strike with a noise
2. Make a clicking or ticking sound
3. Click repeatedly or uncontrollably
4. Cause to make a snapping sound
5. Produce a click
6. Make a clucking sounds, characteristic of hens
7. Become clear or enter one's consciousness or emotions