To "sump" something typically refers to the mechanical or manual process of draining, checking, or clearing accumulated liquid, condensation, or sediment from a sump basin, fuel tank, or aviation water trap. In aviation, for example, pilots and mechanics "sump" fuel tanks before flight by drawing a small sample from the lowest drainage point to inspect for dangerous water contamination or debris. In industrial or mechanical contexts, it involves flushing or pumping out stagnant fluid from a collection reservoir to ensure proper equipment operation.
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