ELI5 mode
A sharper is chiefly a noun denoting a cunning swindler or cheat, especially one who rigs games of chance such as cards through sleight of hand or deception. It also functions as the comparative degree of the adjective 'sharp,' describing something with a keener edge, intellect, or sensory acuity. Today the term carries a slightly archaic or literary flavor, evoking confidence tricksters of earlier centuries while still occasionally appearing in descriptions of modern fraud.
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