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.
Definition of DIFFUSION. 1. : the action of diffusing: the state of being diffused. 2. : prolixity, diffuseness.3.efinition of DIFFUSION. 1. : the action of diffusing: the state of being diffused. 2. : prolixity, diffuseness. 3.