Explaining "The pot calling the kettle black"

What does it mean?

The phrase "The pot calling the kettle black" is an idiom used to describe a situation where someone criticizes another person for a fault they themselves also have.

Tone

Origin

The expression is thought to have originated from 17th-century literature, where both pots and kettles made of cast iron would get darkened by use over a fire, making it ironic for one to criticize the other for being blackened.