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pump has 2 distinct synonyms spread across 1 of its 11 senses. Each sense below keeps its own list, because a synonym belongs to a meaning and not to a word: swapping one sense's substitute into another sense's sentence is how a thesaurus makes writing worse. WordNet records no antonym for it — antonymy is a relation between word forms rather than concepts, so it is deliberately sparse.
Counts are distinct word forms across every sense. A synonym that appears under three senses is counted once here and shown three times below, under each sense it belongs to.
deliver forth
“pump bullets into the dummy”
supply in great quantities
“Pump money into a project”
move up and down
“The athlete pumps weights in the gym”
question persistently
“She pumped the witnesses for information”
a mechanical device that moves fluid or gas by pressure or suction
the hollow muscular organ located behind the sternum and between the lungs; its rhythmic contractions move the blood through the body
“he stood still, his heart thumping wildly”
a low-cut shoe without fastenings
Synonyms, antonyms and the broader and narrower relations for pump come from Princeton University’s WordNet. Full sources and licences.