1. 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.
2. 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.
3. any opening in the side of a building, as in a parapet, for draining off rain water.
Origin: First recorded in 1475–85; Middle English skopor, scopper; further origin uncertain
verb (used with object) British.
1. Military. to overwhelm; surprise and destroy, disable, or massacre.
2. Informal. to prevent from happening or succeeding; ruin; wreck.
Origin: First recorded in 1880–85; originally British military slang “to massacre, slaughter”; further origin uncertain
EXAMPLE SENTENCES FROM THE WEB FOR SCUPPER
As the equality movement found a renewed focus and determination, so its opponents ratcheted up their efforts to scupper it.
HOW ROBIN WILLIAMS’ MRS. DOUBTFIRE WON THE CULTURE WARS|TIM TEEMAN|AUGUST 13, 2014|DAILY BEAST
The minister fears that now even lesser frictions could scupper the new agreement.
TALIBAN SLAMS LOYA JIRGA BILATERAL SECURITY AGREEMENT|RON MOREAU & SAMI YOUSAFZAI|NOVEMBER 26, 2013|DAILY BEAST
The combers were crashing over the weather rail in solid cascades, and the scupper-ports were not large enough to carry it off.
THE VIKING BLOOD|FREDERICK WILLIAM WALLACE
Down from the forecastle roof tumbled Jack Cockrell and went sliding across the deck, heels over head, to fetch up in the scupper.
BLACKBEARD: BUCCANEER|RALPH D. PAINE