stain
stain
noun
A discoloured mark or patch on something, difficult to remove.
"There's a coffee stain on my shirt."
verb
To mark something with a discoloured patch that is difficult to remove.
"Be careful not to stain your new trousers."
Thesaurus
Synonyms: stigma, mark, brand, tarnish, maculate, sully, defile, discoloration, discolouration, blot, smear, smirch