Definition of "Quench" :

verb: cool (hot metal) by plunging into cold water or other liquid

"Quench steel."

verb: reduce the degree of (luminescence or phosphorescence) in (excited molecules or a material) by adding a suitable substance

verb: suppress or crush completely

"Quench a rebellion."

verb: satisfy (thirst)

"The cold water quenched his thirst."

verb: electronics: suppress (sparking) when the current is cut off in an inductive circuit, or suppress (an oscillation or discharge) in a component or device

verb: put out, as of fires, flames, or lights

"Quench the flames."