Etymology From Middle English sompe, either from Middle Dutch somp, sump or Middle Low German sump from Old Saxon *sump, from Proto-West Germanic *sump, ultimately from Proto-Germanic *sumpaz. Doublet of swamp.
Scotland A sudden or heavy fall of rain; a deluge.
then, seating himself thus, he replied to him of the east.—'Sounding sump o' rain Saunders Creeshmeloof—saw ye ever a drap o' rain for eight and forty hours after the bonnie sinking sun that sat sae red and sae lang on the summit of Blackwood hills this blessed afternoon? That starry plow o' thine is […]'1821, “Mark Macrabin, the Cameronian”, in Blackwood's Edinburgh Magazine, page 147:
"Me and the lads did it this morn." "It was pouring!" Brody said. "If I was tae stop an activity because of a sump o' rain, I'd never get anythin' done," Finn remarked with a twinkle in his eye.2024 January 23, Traci Hall, Murder at a Scottish Castle, Kensington Cozies, →ISBN, page 12:
Etymology From Middle English sompe, either from Middle Dutch somp, sump or Middle Low German sump from Old Saxon *sump, from Proto-West Germanic *sump, ultimately from Proto-Germanic *sumpaz. Doublet of swamp.
1
Of a cave passage, to end in a sump, or to fill completely with water on occasion.
We discovered a new passage, but it sumped after 100 metres.
This low passage sumps quickly after moderate rainfall.