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fight off

verb (tr, adverb)
  1. to repulse; repel
  2. to struggle to avoid or repressto fight off a cold
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Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Idioms and Phrases with fight off

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.

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The American Heritage® Idioms Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.