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English definition of “under”

under

preposition (NAME)    /ˈʌn.dər/ US  /-dɚ/
using a particular name , especially one that is not your real name : He writes under the name (of) John le Carré. For his own safety , he has to operate under a false name /an alias .Names and titles Grammar:UnderUnder is a preposition. When we use under as a preposition, it is similar to below. We use under to talk about something that is below or lower than something else:
(Definition of under preposition (NAME) from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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