give a dog a bad name
idiomPart ofdog
give a dog a bad name — idiom
1. Once a person has a bad reputation, it is hard to change because others continue
1.idiom
Definition
Once a person has a bad reputation, it is hard to change because others continue to blame or suspect them.
Example
After the scandal, give a dog a bad name, and no one trusts him.
She made one mistake, but give a dog a bad name, and it sticks.