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Entry 3 senses Webster, 1913

Stumper

/stŭm'-pẽr/ · Stump·er · IPA /ˈstʌmpɚ/
01 n. One who stumps.
  1. 1.
    One who stumps.
  2. 2.
    A boastful person.[Slang]
  3. 3.
    A puzzling or incredible story.[Slang, U.S.]