SUBSI'DE, v.i. [L. subsido; sub and sido, to settle. See Set.]1. To sink or fall to the bottom; to settle; as lees.2. To fall into a state of quiet; to cease to rage; to be calmed; to become tranquil. Let the passions subside. The tumults of war will subside. Christ commanded, and the storm subsided.3. To tend downwards; to sink; as a subsiding hill. The land subsides into a plain.4. To abate; to be reduced. In cases of danger, pride and envy naturally subside.