To make dirty.
To defame or sully.
To cook (meat or fish) by coating with pepper, etc., and quickly searing in a hot pan.
To become black.
To cause to be or become black.
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.