Breadcrumb Home > Thesaurus > S Synonyms of sump Find synonyms for: Noun 1. sump, reservoir usage: an oil reservoir in an internal combustion engine 2. sump, well usage: a well or other hole in which water has collected 3. cesspool, cesspit, sink, sump, cistern usage: a covered cistern; waste water and sewage flow into it WordNet 3.0 Copyright © 2006 by Princeton University. All rights reserved.Definition and meaning of sump (Dictionary) TrendingHere are the facts and trivia that people are buzzing about. Chinese New Year History, Meaning, and Celebrations Current Events This Week: February 2024 Valentine's Day Valentine's Day History Mardi Gras 30 "Charlie and the Chocolate Factory" Quotes ✖ Related Content Daily Word Quiz: quisling Analogy of the Day: Today’s Analogy Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language