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fight off

B1 neutral separable transitive
In simple words

To successfully stop someone or something from harming you by fighting hard.

Literal meaning: To fight someone or something in the direction off (away from you), successfully pushing it back.

Meanings

1 B1 neutral

To defend yourself successfully against a physical attacker by fighting.

"She managed to fight off her assailant and escape."

Grammar: separable
2 B1 idiomatic neutral

To overcome or recover from an illness or infection.

"It took him two weeks to fight off the infection."

Grammar: separable
3 B2 idiomatic neutral

To resist or overcome a competitor, challenge, or rival successfully.

"The champion fought off a strong challenge from the young contender to retain his title."

Grammar: separable
Usage notes

Used in physical, medical, and figurative contexts. Very common in sports reporting ('fight off a challenge') and health contexts ('fight off a cold'). Implies success — the threat is repelled. Compare with 'fight back', which focuses on the resistance, not necessarily the outcome.

Commonly used with

attacker illness infection challenge competition fatigue

Forms

Base
fight off
I/you/we/they
3rd person
fights off
he/she/it
Past simple
fought off
yesterday
Past participle
fought off
have + pp
-ing form
fighting off
continuous

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