slakev. t.[OE. slaken to render slack, to slake, AS. sleacian, fr. sleac slack. See Slack, v. & a.]1. To allay; to quench; to extinguish; as, to slake thirst.(Spenser.)It could not slake mine ire nor ease my heart. (Shak.)2. To mix with water, so that a true chemical combination shall take place; to slack; as, to slake lime.()v. i.1. To go out; to become extinct.(Sir T. Browne.)2. To abate; to become less decided.(Shak.)3. To slacken; to become relaxed.(Sir J. Davies.)4. To become mixed with water, so that a true chemical combination takes place; as, the lime slakes.()Slake trough, a trough containing water in which a blacksmith cools a forging or tool.()