To extinguish or put out (as a fire or light).
[…] others ſaying, the fire would ceaſe as ſoon as it had vent, uncovered a great part of the houſe, breaking down the roofs, and destroying all that ſtood in their way. None of them went about to quench the fire, but all were employed in pulling down the houſe, […]
To cool rapidly by direct contact with liquid coolant, as a blacksmith quenching hot iron.
The swordsmith quenched the sword in an oil bath so that it wouldn't shatter.
The act of quenching something; the fact of being quenched.
Then the MacManus [i.e. a ship] went down. The sudden quench of the white light was how I knew it.
The abnormal termination of operation of a superconducting magnet, occurring when part of the superconducting coil enters the normal (resistive) state.
From Middle English quenchen, from Old English cwenċan, from Proto-Germanic *kwankijaną.
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A rapid change of the parameters of a physical system.