Select the most appropriate meaning of the given idiom.

A bad egg

Someone who is dishonest and unreliable

The most appropriate meaning of the idiom "a bad egg" is someone who is dishonest and unreliable. It is an informal expression that refers to someone who is considered to be of bad character, especially someone who is untrustworthy or likely to cause trouble. The idiom is thought to have originated in the 19th century, and it is believed to be a reference to the way that a rotten egg can spoil a whole carton of eggs.

The other options for the meaning of the idiom are incorrect. Someone who doesn't like eggs does not mean that they are a bad person. Someone who likes to break eggs does not mean that they are a bad person. Someone who regularly makes mistakes does not mean that they are a bad person.