/ kwentʃ; NAmE / verb [ vn ]
1.
quench your thirst to drink so that you no longer feel thirsty
SYN slake
2.
( formal ) to stop a fire from burning
SYN extinguish :
Firemen tried to quench the flames raging through the building.
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WORD ORIGIN
Old English -cwencan (in acwencan put out, extinguish ), of Germanic origin.