subside (v.) Look up subside at Dictionary.com
1680s, of objects, "to sink to the bottom," from Latin subsidere "sit down, settle, sink, fall; remain; crouch down, squat," from sub "under, beneath" (see sub-) + sidere "to settle," related to sedere "to sit" (see sedentary). Of liquid surfaces, "to sink to a lower level, be reduced" from 1706. Related: Subsided; subsiding.