scupper1
  
  n.
 a hole in a ship's side to allow water to run away from the deck.
 
  Etymology
  ME: perh. via Anglo-Norman Fr. from OFr. escopir ‘to spit’.
 
  
    
scupper2
  
  v.
 chiefly Brit.  - sink (a ship) deliberately.
 - informal prevent from working or succeeding; thwart.
 
 
  Etymology
  C19 (as military sl. in the sense ‘kill, especially in an ambush’): of unknown origin.