The spelling of the phrase "whatever under" is straightforward, with each word pronounced as it is spelled. In IPA phonetic transcription, the word "whatever" would be written as /wʌtˈɛvər/ and "under" as /ˈʌndər/. Together, the phrase would be pronounced /wʌtˈɛvər ˈʌndər/. This phrase is often used to refer to anything that may be hidden or not visible, implying a sense of mystery or uncertainty. Its spelling and pronunciation are easily accessible to English speakers of all levels.