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quench has 8 distinct synonyms spread across 3 of its 6 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.
electronics: suppress (sparking) when the current is cut off in an inductive circuit, or suppress (an oscillation or discharge) in a component or device
reduce the degree of (luminescence or phosphorescence) in (excited molecules or a material) by adding a suitable substance
cool (hot metal) by plunging into cold water or other liquid
“quench steel”
Synonyms, antonyms and the broader and narrower relations for quench come from Princeton University’s WordNet. Full sources and licences.