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.
dissolve verb (BE ABSORBED) C2 [ I or T ] (of a solid) to be absorbed by a liquid, especially when mixed, or (of a liquid) to absorb a solid: Dissolve two spoons of powder in warm water. Nitric acid will dissolve most animal tissue. More examples.