Subside Sub*side", v. i. [imp. & p. p. Subsided; p. pr. & vb. n. Subsiding.] [L. subsidere; sub under, below + sidere to sit down, to settle; akin to sedere to sit, E. sit. See Sit.] 1. To sink or fall to the bottom; to settle, as lees. 2. To tend downward; to become lower; to descend; to sink. ``Heaven's subsiding hill.'' --Dryden. 3. To fall into a state of quiet; to cease to rage; to be calmed; to settle down; to become tranquil; to abate; as, the sea subsides; the tumults of war will subside; the fever has subsided. ``In cases of danger, pride and envy naturally subside.'' --C. Middleton. Syn: See Abate.