n. a stupid person; a gullible person. : See if that chump will loan you some money.
Dictionary of American Slang and Colloquial Expressions by Richard A. Spears.Fourth Edition. Copyright 2007. Published by McGraw Hill.
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Word Origin & History
chump
1703, "short, thick lump of wood," akin to O.N. kumba "block of wood." Meaning "blockhead" is first attested 1883.