#1 scupper n. drain that allows water on the deck of a vessel to flow overboard. wn
#2 scupper v. [ambush, bushwhack, waylay, lurk, ambuscade, lie in wait] wait in hiding to attack. wn
#3 scupper v. [queer, expose, endanger, peril] put in a dangerous, disadvantageous, or difficult position. wn
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