A loud sound, like the crashing together of metal objects.

“I heard a clash from the kitchen, and rushed in to find the cat had knocked over some pots and pans.”

A skirmish, a hostile encounter.

A match; a game between two sides.

To make a clashing sound.

“The cymbals clashed.”

To cause to make a clashing sound.

To come into violent conflict.

“Fans from opposing teams clashed on the streets after the game.”