From Longman Dictionary of Contemporary Englishit doesn’t matterit doesn’t matterspokena)WORRIEDused to tell someone that you are not angry or upset about something, especially something that they have done‘I’ve spilled some coffee on the carpet.’ ‘It doesn’t matter.’b)DON'T CAREused to say that you do not mind which one of two things you have‘Red or white wine?’ ‘Oh, either. It doesn’t matter.’ →matter
Examples from the Corpus
it doesn’t matter• "Do you want white or darkmeat?" "Oh, it doesn't matter."• "I think I taped over your show." "It doesn't matter - I already watched it."• It doesn't matter if you're a few minutes late. We'll wait for you.• "We've missed the train." "It doesn't matter - there's another one in 10 minutes."• It doesn't matter what other people think. You should do what you think is best.• It calls for brownsugar, but it doesn't matter - you can use white.