English pronunciation of “under”

under

uk How to pronounce under preposition in British English
us How to pronounce under preposition in American English
uk How to pronounce under adverb in British English
us How to pronounce under adverb in American English
uk How to pronounce under prefix in British English
us How to pronounce under prefix in American English

(English pronunciations of “under” from the Cambridge Advanced Learner’s Dictionary & Thesaurus and from the Cambridge Academic Content Dictionary, both sources © Cambridge University Press)