fight

For the verb: "to fight"

Simple Past:	fought
Past Participle:	fought

Concise Oxford English Dictionary © 2008 Oxford University Press:
fight/fʌɪt/

▶verb (past and past part. fought)

• 1 take part in a violent struggle involving physical force or weapons.

  ■ engage in (a war or contest).

  ■ quarrel or argue.

  ■ (fight someone/thing off) defend oneself against an attack by someone or something.

• 2 struggle to overcome, eliminate, or prevent.

  ■ try very hard to obtain or achieve something: I will fight for a fairer society.

• 3 (fight one's way) move forward with difficulty.

▶noun an act of fighting.

■ a vigorous struggle or campaign.

■ the inclination or ability to fight or struggle.

– phrases
fight fire with fire use the weapons or tactics of one's opponent, even if one finds them distasteful.
fight shy of be unwilling to undertake or become involved with.
fight or flight the instinctive physiological response to a threatening situation, which readies one either to resist forcibly or to run away.

– origin OE feohtan (v.), feoht(e), gefeoht (n.), of W. Gmc origin.