Merriam-Webster Collegiate Dictionary - slake

 verb  (~d; slaking)  Etymology: Middle English, from Old English slacian, from sleac slack  Date: 14th century  intransitive verb  1. archaic subside, abate  2. to become ~d ; crumble lime may ~ spontaneously in moist air  transitive verb  1. archaic to lessen the force of ; moderate  2. satisfy, quench ~ your thirst will ~ your curiosity  3. to cause (as lime) to heat and crumble by treatment with water ; hydrate