Etymology
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scupper (n.)

"opening in a ship's side at deck level to let the water flow out," early 15c. (implied in scoper-nail "nail used to attach scupper leathers to a ship"), perhaps from Old French escopir "to spit out," because the water seems to spit out of it, or related to Dutch schop "shovel," or from Middle English scope "scoop" (see scoop (n.)).

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Definitions of scupper
1
scupper (v.)
wait in hiding to attack;
Synonyms: ambush / bushwhack / waylay / lurk / ambuscade / lie in wait
scupper (v.)
put in a dangerous, disadvantageous, or difficult position;
Synonyms: queer / expose / endanger / peril
2
scupper (n.)
drain that allows water on the deck of a vessel to flow overboard;
From wordnet.princeton.edu