give a dog a bad name

Meaning

1. when a person already has a bad reputation, it is difficult to change it because others will continue to blame or suspect him / her

From the same entry

• a dog and pony show
• dog eat dog
• a dog in the manger
• a dog's breakfast
• a dog's life
• every dog has his day
• go to the dogs
• not have a dog's chance
• why keep a dog and bark yourself
• the hair of the dog
• be raining cats and dogs
• sick as a dog