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sump pit

n. (context chiefly US English) a hole dug in the ground beneath the basement of a house in which rainwater etc collects

Usage examples of "sump pit".

The cuttings, screened from the mud as it flowed back into the sump pit, showed us still in the metamorphic rock.

Dressing as swiftly as she could and grabbing her jewels and what money she had, she went through the connecting door in the garage and hid in the sump pit which Mr Simplon, who liked tinkering with the underbodies of cars as well as Mrs Grabble's, had thoughtfully constructed.