fight off

World English Dictionary
fight off
 
vb
1.  to repulse; repel
2.  to struggle to avoid or repress: to fight off a cold

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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American Heritage
Idioms & Phrases

fight off

Defend against, drive back, as in I've been fighting off a cold all week. This figurative use of the term, originally meaning "to repel an enemy" dates from the early 1800s.

The American Heritage® Dictionary of Idioms by Christine Ammer.
Copyright © 1997. Published by Houghton Mifflin.
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