Quench. What a fabulous word. You can almost hear the juices being squeezed out of it when you say it.
It means to put an end to a thirst, or a fire.
The word quench is from the Old English word ācwencan, which means to put out (as in flames) and before that it came from the lovely Old Frisian word quinka, to vanish.
And now I must go and get myself a cup of tea...