to not hurt a fly
01
to refrain from doing anything that would harm or threaten the life of any person or animal
![to {not} [hurt|harm] a (fly|flea) definition and meaning](https://cdn.langeek.co/photo/38713/original/pleased?type=jpeg "to {not} [hurt|harm] a (fly|flea) definition and meaning")
Approving
Idiom
例
Despite his intimidating appearance, he's actually really kind-hearted and would n't harm a flea.
He may have a tough exterior, but deep down, he has a gentle heart and would n't hurt a flea.
