Etymology
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slake (v.)

late Old English sleacian, slacian "become slack or remiss; slacken an effort" (intransitive); "delay, retard" (transitive), from slæc "lax" (see slack (adj.)). Transitive sense of "make slack" is from late 12c. Sense of "allay, diminish in force, quench, extinguish" (in reference to thirst, hunger, desire, wrath, etc.) first recorded early 14c. via notion of "make slack or inactive." Related: Slaked; slaking.

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Definitions of slake

slake (v.)
satisfy (thirst);
Synonyms: quench / allay / assuage
slake (v.)
make less active or intense;
Synonyms: abate / slack
slake (v.)
cause to heat and crumble by treatment with water;
Synonyms: slack
From wordnet.princeton.edu