to relieve or satisfy (thirst) with liquid
to bring (something) to an end, esp by satisfying, damping, or decreasing it
the praise that quenches all desire to read the book — T S Eliot
to extinguish (e.g. a fire)
to cool (e.g. hot metal) suddenly by immersion in oil, water, etc
quenchable adj
quencher noun
quenchless adj
[Old English ācwencan to extinguish]