
Not harm/hurt a fly
Gentle Character
Use this phrase to emphasize someone's peaceful nature without suggesting physical weakness or cowardice.

My grandmother is so caring, she wouldn't hurt a fly.
Non-literal Meaning
The phrase is not about flies. It's an exaggerated way to say someone is non-violent.

He's a pacifist and wouldn't harm a fly.
Emotional Emphasis
The phrase can also imply affection or protectiveness towards the person described.

Don't yell at her; she wouldn't harm a fly.
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