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.
verb (used with object), dissipated, dissipating. 1. to scatter in various directions; disperse; dispel. 2. to spend or use wastefully or extravagantly; squander; deplete: to dissipate one's talents; to dissipate a fortune on high living. verb (used without object), dissipated, dissipating.