1 to satisfy (one's thirst, desires, etc.); slake
2 to put out (a fire, flame, etc.); extinguish
3 to put down or quell; suppress
to quench a rebellion
4 to cool (hot metal) by plunging it into cold water
5 (Physics) to reduce the degree of (luminescence or phosphorescence) in (excited molecules or a material) by adding a suitable substance
a to suppress (sparking) when the current is cut off in an inductive circuit
b to suppress (an oscillation or discharge) in a component or device
(Old English acwencan to extinguish; related to Old Frisian quinka to vanish)
English Collins Dictionary - English Definition & Thesaurus
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"Collins English Dictionary 5th Edition first published in 2000 © HarperCollins Publishers 1979, 1986, 1991, 1994, 1998, 2000 and Collins A-Z Thesaurus 1st edition first published in 1995 © HarperCollins Publishers 1995"