People who con others by tricking or swindling them, or people involved in corner plays in cards or games.
From 'con' (confidence trick), shortened from 'confidence game' where a swindler builds someone's trust before stealing from them. The '-er' suffix makes it an agent noun.
A 'con' artist was originally called this because they built 'confidence' with their victims before betraying it—they're playing a game of trust that was never real from the start!
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