From Longman Dictionary of Contemporary Englishdon’t mention itdon’t mention itspokenTHANK used to say politely that there is no need for someone to thank you for helping them ‘Thanks for the ride home!’ ‘Don’t mention it.’ → mention
Examples from the Corpus
don’t mention it• "Thanks for the lift!" "Oh, don't mention it!"• "Thanks for the ride home!" "Don't mention it." 