not hurt a fly or flea

not hurt a fly
also not hurt a flea

Meaning

• To not be able to cause harm to anyone, including even a tiny and insignificant insect.
• This phrase refers to not being able to hurt even something that can hurt that person.
• To not physically injure or verbally offend anyone.

Example Sentences

1. He is such an innocent little child, he could not hurt a fly.
2. Her daughter seems like she could not hurt a flea but she is not so in reality.
3. Although he is tough professional but when you know him personally, you would know that he would not hurt a fly.
4. She confessed that she would not hurt a flea unless she is provoked.
5. My kid is as sweet as honey and would not hurt a fly.
6. His dog is amongst the biggest ones that I have ever seen. And although he is constantly chewing on the home furniture, they say he would not hurt a flea.

Origin
The origin of this phrase is not available.

Synonym and Variant
Not hurt a fly. It is believed that this was a base idiom which evolved into the word ‘Fly' being replaced by ‘Flea', there is no confirmation of this fact though. Both are correct to be used in the same context.