sump

US /sʌmp/
UK /sʌmp/
"sump" picture
1.

a pit or hollow in which liquid collects, especially one in the floor of a workshop into which waste oil and water drain.

:
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The mechanic drained the oil into the sump.
•
Water collected in the basement sump after the heavy rain.
:
pitreservoirbasinwellcistern