if your body fights off an illness, it prevents the illness from making you ill
to stop someone who is trying to attack you
At the far end they have a job to fight off our fellows trying to help themselves.
For anything to help him fight off the dizzying assault of sleep.
Let's try to cripple their communications, destroy as many planes as possible, and then help fight off the attack on the city.
The woman managed to fight off her attackers.
We also fight off the occasional troll or ogre that comes too far south.
fights off
fighting off
fought off
There is no origin for this phrasal verb
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