Thwart or destroy, especially something belonging or pertaining to another; compare scuttle
We can't allow US tantrums to scupper global justice..
An opening in the side of a ship at deck level to allow water to run off An opening for draining off water, as from a floor or the roof of a building
an opening in the floor portion of a bridge to provide means for rain or other water accumulated upon the roadway surface to drain through it into the space beneath the structure
Any opening or drain in the side of a structure, flat roof, or downspout for the drainage of rain water
To scupper a plan or attempt means to spoil it completely. If Schneider had seen him that would have scuppered all his plans. a hole in the side of a ship that allows water to flow back into the sea