not hurt a flea

not hurt a flea

To harm nothing or no one. Said of one who is particularly gentle, shy, diffident, or timid by nature. My brother is a very sweet, warm-hearted man who wouldn't hurt a flea. How can you suspect him of committing this crime?
See also: flea, hurt, not
Farlex Dictionary of Idioms.

not hurt a flea

Fig. not to harm anything or anyone, even a tiny insect. (Also with other forms of negation.) Ted would not even hurt a flea. He could not have struck Bill. Ted would never hurt a flea, and he would not hit anyone as you claim.
See also: flea, hurt, not
McGraw-Hill Dictionary of American Idioms and Phrasal Verbs.
See also:
  • as one man
  • drive (one) out of office
  • force (one) out of office
  • force out of office
  • give (one) (one's) head
  • give head
  • give somebody their head
  • give someone their head
  • cooking for one
  • 1FTR