1. (verb) scupper
drain that allows water on the deck of a vessel to flow overboard
2. (verb) ambush, scupper, bushwhack, waylay, lurk, ambuscade, lie in wait
wait in hiding to attack
Synonyms: loaf, mill around, scupper, lie in wait, loiter, lallygag, expose, endanger, queer, peril, mess about, hang around, lollygag, waylay, mill about, tarry, skulk, footle, ambush, still-hunt, linger, lounge, ambuscade, lurk, bushwhack
3. (verb) queer, expose, scupper, endanger, peril
put in a dangerous, disadvantageous, or difficult position
Synonyms: scotch, bushwhack, let on, frustrate, bring out, unwrap, exhibit, disclose, endanger, foil, lurk, jeopardise, expose, waylay, peril, reveal, debunk, thwart, imperil, threaten, give away, break, baffle, divulge, queer, spoil, lie in wait, ambush, menace, jeopardize, scupper, cross, uncover, ambuscade, bilk, display, discover, let out
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Synonyms and Antonyms of scupper 
