bad penny
bad penny · bad pennies
A person or thing which is unpleasant, disreputable, or otherwise unwanted, especially…A person or thing which is unpleasant, disreputable, or otherwise unwanted, especially one which repeatedly appears at inopportune times.
» A bad penny always turns up.
Meaning
2 senses(idiomatic)A person or thing which is unpleasant, disreputable, or otherwise unwanted, especially one which repeatedly appears at inopportune times.
Used other than figuratively or idiomatically: see bad, penny: A counterfeit or damaged penny.
Examples
3 sentencesA bad penny always turns up.
You're like a bad penny, Tom.
A bad penny always comes back.