click

Concise Oxford English Dictionary © 2008 Oxford University Press:
click/klɪk/

▶noun a short, sharp sound as of two hard objects coming smartly into contact.

■ a speech sound produced by sudden withdrawal of the tongue from the soft palate, front teeth, or back teeth and hard palate, occurring in some southern African and other languages.

■ Computing an act of pressing one of the buttons on a mouse.

▶verb

• 1 make or cause to make a click.

  ■ Computing press (one of the buttons on a mouse).

• 2 informal become suddenly clear and understandable.

  ■ become friends or be compatible from the outset.

– derivatives
clickable adjective,
clicker noun,
clicky adjective.

– origin C16 (as v.): imitative.