noun
a colored patch or dirty mark that is difficult to remove
verb
to leave a mark on something that is difficult to remove
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The red wine stain on the white tablecloth was difficult to remove.
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I accidentally spilled coffee on the carpet and now there's a huge stain.
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She was so mad that she threatened to stain his reputation if he didn't apologize.
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The scandal left a permanent stain on the politician's career.