Meaning of “fight” - Learner’s Dictionary

fight

verb uk us /faɪt/ (past tense and past participle fought)
USE FORCE [ I, T ]

B1 When people fight, they use physical force to try to defeat each other:

Two men were arrested for fighting outside a bar.
Sam's always fighting with his little brother.
JOIN WAR [ I, T ]

B2 to take part in a war:

Millions of young men fought in World War I.
ARGUE [ I ]

B2 to argue:

We've got to stop fighting in front of the children.
TRY TO STOP [ I, T ]

B2 to try hard to stop something bad happening:

He fought against racism.
New measures have been introduced to fight crime.
Aspirin and vitamin C help fight colds and flu.
TRY TO ACHIEVE [ I ]

B2 to try hard to achieve something you want or think is right:

They are fighting for their freedom.
[ + to do sth ] He had to fight very hard to keep his job.
be fighting for your life

to be trying very hard to stay alive when you are very sick or badly injured

→ See also fight a losing battle

(Definition of “fight verb” from the Cambridge Learner’s Dictionary © Cambridge University Press)