Sump/sʌmp/ Definition 1 of 2Pro Tip 1/3Machine Maintenance Used in contexts related to routine care or repair of machinery. Remember to check the sump for debris during your monthly maintenance checks. Pro Tip 2/3Automotive Part Refers specifically to the section under an engine that holds lubricants like oil. The mechanic drained the sump before replacing the oil filter. Pro Tip 3/3Associated Tools Often mentioned with tools like pumps, suggesting removal of collected substances. We need to install a sump pump to clear out the excess fluid.