Tarnish
Part of speech: noun
Definition: Oxidation or discoloration, especially of a decorative metal exposed to air.
Part of speech: verb
Definition: To oxidize or discolor due to oxidation. To soil, sully, damage or compromise
Defile
Part of speech: noun
Definition: A way or gorge so narrow that only one person at a time can pass.
Part of speech: verb
Definition: to make impure; to make dirty. Less strong than to pollute(intransitive) To march in a single file.