late 14c., "to gallop," possibly from O.N.Fr. *waloper (13c.), probably from Frankish *walalaupan "to run well" (cf. O.H.G. wela "well" and Old Low Franconian loupon "to run, leap"). The verb meaning "to thrash" (1820) and the noun meaning "heavy blow" (1823) may be separate developments, of imitative
n. a hard blow. : She planted a hard wallop on his right shoulder.
tv. to strike someone or something hard. : The door swung open and walloped me in the back.
n. influence; pull; clout. : I don't have enough wallop to make that kind of demand.
Dictionary of American Slang and Colloquial Expressions by Richard A. Spears.Fourth Edition. Copyright 2007. Published by McGraw Hill.
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