thrash

Concise Oxford English Dictionary © 2008 Oxford University Press:
thrash/θraʃ/

▶verb

• 1 beat repeatedly and violently with or as with a stick or whip.

• 2 move in a violent or uncontrolled way: he lay thrashing around in pain.

• 3 informal defeat heavily.

• 4 (thrash something out) discuss something frankly and thoroughly, especially to reach a decision.

▶noun

• 1 a violent or noisy movement of beating or thrashing.

  ■ informal a fast and exciting motor race or other sporting event.

• 2 Brit. informal a party, especially a loud or lavish one.

• 3 (also thrash metal) a style of fast, loud, harsh-sounding rock music, combining elements of punk and heavy metal.

– origin OE, var. of thresh.