not hurt a fly
American Heritage Dictionary of Idioms:
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not hurt a fly
Also, not hurt a flea. Not cause harm to anyone, be gentle and mild, as in Paul's the kindest man--he wouldn't hurt a flea, or Bert has a temper but it's all talk; he wouldn't hurt a fly. Both fly and flea are used in the sense of "a small insignificant animal." [Early 1800s]
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American Heritage Dictionary of Idioms
The American Heritage® Dictionary of Idioms by Christine Ammer. Copyright © 1997 by The Christine Ammer 1992 Trust. Published by Houghton Mifflin Company. All rights reserved.
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