Sink Sink, v. i. [imp. Sunk, or (Sank); p. p. Sunk (obs. Sunken, -- now used as adj.); p. pr. & vb. n. Sinking.] [OE. sinken, AS. sincan; akin to D. zinken, OS. sincan, G. sinken, Icel. s["o]kkva, Dan. synke, Sw. sjunka, Goth. siggan, and probably to E. silt. Cf. Silt.] 1. To fall by, or as by, the force of gravity; to descend lower and lower; to decline gradually; to subside; as, a stone sinks in water; waves rise and sink; the sun sinks in the west. I sink in deep mire. --Ps. lxix. 2. 2. To enter deeply; to fall or retire beneath or below the surface; to penetrate. The stone sunk into his forehead. --1 San. xvii. 49. 3. Hence, to enter so as to make an abiding impression; to enter completely. Let these sayings sink down into your ears. --Luke ix. 44. 4. To be overwhelmed or depressed; to fall slowly, as so the ground, from weakness or from an overburden; to fail in strength; to decline; to decay; to decrease. I think our country sinks beneath the yoke. --Shak. He sunk down in his chariot. --2 Kings ix. 24. Let not the fire sink or slacken. --Mortimer. 5. To decrease in volume, as a river; to subside; to become diminished in volume or in apparent height. The Alps and Pyreneans sink before him. --Addison. Syn: To fall; subside; drop; droop; lower; decline; decay; decrease; lessen.