Some people only have the problem when they run water in a sink or a bathtub. The source of the odor in almost all of these instances is a buildup of biofilm on the sides of the pipes that connect the sink or fixture to the actual P-shaped trap under the fixture.
Subsided is defined as  calmed down or sunk to a lower level. When the noise of a crowd dies down, this is an example of when the noisesubsided.
dissipate (third-person singular simple present dissipates, present participle dissipating, simple past and past participle dissipated) To drive away, disperse. Cook I soon dissipated his fears. Hazlitt The extreme tendency of civilization is to dissipate all intellectual energy.