The pot calling the kettle black
"The pot calling the kettle black" is a proverbial idiom that may be of Spanish origin, of which English versions began to appear in the first half of the 17th century. It means a situation in which somebody accuses someone else of a fault which the accuser shares, and therefore is an example of psychological projection, or hypocrisy. Use of the expression to discredit or deflect a claim of wrongdoing by attacking the originator of the claim for their own similar behaviour (rather than acknowledging the guilt of both) is the tu quoque logical fallacy. Origin The earliest appearance of the idiom is in Thomas Shelton's 1620 translation of the Spanish novel Don Quixote. The protagonist is growing increasingly restive under the criticisms of his servant Sancho Panza, one of which is that "You are like what is said that the frying-pan said to the kettle, 'Avant, black-browes'." The Spanish text at this point reads: (Said the pan to the pot, get out of there black-eyes). It is identified as a proverb (refrán) in the text, functioning as a retort to the person who criticises another of the same defect that he plainly has. Among several variations, the one where