The word "underside" in English means: The bottom surface of something., The hidden or less visible part of something, often with negative connotations..
The phonetic transcription of "underside" is /ˈʌndəsaɪd/ in British English and /ˈʌndərsaɪd/ in American English. Click the 🔊 button to hear both pronunciations.
Synonyms for "underside": bottom, belly, reverse.
Example usage of "underside": "The underside of the car was covered in rust.". More examples on the page.