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sucker-punch

[suhk-er-puhnch]
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verb (used with object) Slang.
  1. to strike (someone) with an unexpected blow.
Related formssucker punch, noun
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

Word Origin and History for suckerpunch

n.

also sucker punch, 1926, from sucker + punch. Figurative use by 1929. As a verb by 1942. Related: Sucker-punched.

Online Etymology Dictionary, © 2010 Douglas Harper