While I was reading the news I found a sentence
Newcastle's Cheick Tiote responds to 'bad egg' claims
What is the meaning of bad egg here?
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A "bad egg" is a phrase used to suggest that someone is a villain, evil, or criminal. Informally, I have heard this phrase used to describe people as troublemakers or malicious, but not necessarily criminals.
In the newsline, "Newcastle's Cheick Tiote responds to 'bad egg' claims", the author of the news article is using 'bad egg' to suggest Cheick Tiote is responding to people's claims that he is potentially criminal or evil as the same people claim that he had spread poison in Newcastle United's dressing room.