1 [skuhp-er]
Nautical. a drain at the edge of a deck exposed to the weather, for allowing accumulated water to drain away into the sea or into the bilges. Compare freeing port.
a drain, closed by one or two flaps, for allowing water from the sprinkler system of a factory or the like to run off a floor of the building to the exterior.
any opening in the side of a building, as in a parapet, for draining off rain water.

1475–85; earlier skoper. See scoop, -er1 Unabridged


2 [skuhp-er]
verb (used with object) British.
Military. to overwhelm; surprise and destroy, disable, or massacre.
Informal. to prevent from happening or succeeding; ruin; wreck.

1880–85; origin uncertain Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
scupper1 (ˈskʌpə)
1.  nautical a drain or spout allowing water on the deck of a vessel to flow overboard
2.  an opening in the side of a building for draining off water
3.  a drain in a factory floor for running off the water from a sprinkler system
[C15 skopper, of uncertain origin; perhaps related to scoop]

scupper2 (ˈskʌpə)
1.  slang to overwhelm, ruin, or disable
2.  to sink (one's ship) deliberately
[C19: of unknown origin]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Word Origin & History

"opening in a ship's side at deck level," late 15c., perhaps from O.Fr. escopir "to spit out," or related to Du. schop "shovel," or from M.E. scope "scoop" (see scoop).
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
Scientists find that some types of sea snake possess homing behavior that may scupper conservation efforts.
So the discovery of a neutron star with a stronger field would immediately scupper it.
If elections do not take place, the resulting void might scupper future loans, which must be ratified by parliament.
The detail shows a wood nailer for the transition between the insulation and the scupper penetration.
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