Specialist use in mining/caving meaning ‘to become or cause to become completely water-filled’.
Definitionen
To fill or become filled with water so as to form a sump; to submerge completely. After the storm, the lower tunnel sumped and became inaccessible.
Attributive use before another noun (e.g., "sump pump"). Not normally gradable.
Definitionen
Designed for use with or relating to a sump. They installed a new sump pump to keep the crawl space dry.