Difference between Repel and Fight Off

REPEL vs FIGHT OFF: VERB

To drive back; to force to return; to check the advance of; to repulse as, to repel an enemy or an assailant.
To resist or oppose effectually.

Cause aversion in
Be repellent to
In medicine, to prevent such an afflux of fluids to any particular part as would render it tumid or swollen.
To act with force in opposition to force impressed; antagonize.
Synonyms and Decline, Reject, etc. (see refuse), parry, ward off, defeat.
To drive back or away: the opposite of attract. See repulsion.
To encounter in any manner with effectual resistance; resist; oppose; reject: as, to repel an encroachment; to repel an argument.
To drive back; force to return; check the advance of; repulse: as, to repel an assailant.

Resist, Push back, Force back, Fight off, Drive off, Drive back, Beat back, Turn off, Brush off, Disgust, Revolt, Snub, Drive, Rebuff, Repulse

Rebut, Reject, Defeat, Counter, Displace, Suppress, Foil, Vanquish, Resist, Brush off, Disgust, Revolt, Snub, Drive, Repulse

Do like charges repel or attract one another?
Capitol grounds, as if to repel an attack.
The ability of water to repel other substances.
It is wrapped in copper to repel sperm.
Lemongrass planted around the home will repel snakes.
Instantly they took measures to repel the attack.
Why do some risks appeal while others repel?
Can Bags Full of Water Really Repel Flies?
All electrons are alike and repel each other.
For example some alkyl groups can only repel water but not oil and others can repel both water and oil.

AC trying to fight off the summer heat.
Yes, motivational tables tend to fight off benzos.
Your body makes antibodies to fight off allergens.
Most women fight off HPV within two years.
Contains strong antiviral compounds to fight off EBV.
Nor can your body fight off every invader.
Shaq vs JaVale McGee wouldn't have been a fair fight on the court, and it wasn't a fair fight off the court.
The chemical products fight off the solid buildup of grime and support in washing them off of the different parts.
A handful of muscle-bound Spartans hold off the world's largest army, but fail to fight off the yawns.
Both of them attempt to fight off the fish and protect their babies, but Marlin is knocked unconscious in the fight.