Definition of under adjective from the Oxford Advanced Learner's Dictionary

 

under

 adjective
adjective
BrE BrE//ˈʌndə(r)//
 
; NAmE NAmE//ˈʌndər//
 
 
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[only before noun] lower; underneath the under layer the under surface of a leaf Word Origin Old English, of Germanic origin; related to Dutch onder and German unter.
See the Oxford Advanced American Dictionary entry: under