Example sentences? They would be something like: 'The sauce made a huge stain on my shirt." "I was able to wash the stain away." "The stain can't be washed away.' 'The detergent is too weak to wash the stain."

This stain won't come out. Your collar has a stain on it. How do you remove red wine stain from your carpet. Do you have anything to remove stains?

" I spilled some juice on my shirt and because of that I have a stain on my shirt". " Almost all politicans have their reputation stained by scandals" or " He has finished his political career without a stain on his character". 1st sentence/ stain means to leave a mark on something for example on shirt or any other piece of clothing, and it is difficult to remove. However, stain may refer to character/reputation as a permanent damage to someone reputation/career.