To dirty; to make dirty.
To harm the reputation of; to smear or slander.
A chirp of radiation power from an astronomical body that has a smeared appearance on its plot in the time-frequency plane (usually associated with massive bodies orbiting supermassive black holes)
A stain on somebody's reputation.
Dirt, or a stain.
To compromise, damage, soil, or sully.
To lose its lustre or attraction; to become dull.
To oxidize or discolor due to oxidation.
Oxidation or discoloration, especially of a decorative metal exposed to air.