Meaning of the word "give a dog a bad name and hang him" in English

What does "give a dog a bad name and hang him" mean in English? Explore the meaning, pronunciation, and specific usage of this word with Lingoland.

give a dog a bad name and hang him

US /ɡɪv ə dɔɡ ə bæd neɪm ænd hæŋ hɪm/
UK /ɡɪv ə dɒɡ ə bæd neɪm ənd hæŋ hɪm/
"give a dog a bad name and hang him" picture

Idiom

once a person's reputation has been blackened, it is very difficult for them to recover it, as people will continue to believe the worst about them

Example:
He was accused of theft years ago and still can't find a job; give a dog a bad name and hang him.
The media keeps bringing up her past mistakes; it's a case of give a dog a bad name and hang him.