The phonetic transcription of "don't mention it" is /dəʊnt ˈmenʃən ɪt/ in British English and /doʊnt ˈmenʃən ɪt/ in American English. Click the 🔊 button to hear both pronunciations.
Synonyms for "don't mention it": you're welcome, no problem, not at all, my pleasure.
Example usage of "don't mention it": "Thanks for the help! - Oh, don't mention it.". More examples on the page.