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.
a shallow depression, or furrow on the surface of an organ, such as cerebral sulcus that separates the convolutions of the cerebral hemisphere. A sulcus is usually not as deep as a fissure, but, in the terminology of anatomy, the words sulcus and fissure are often used interchangeably. sulcate, adj.