English

Definition of buttoned-up adjective from the Oxford Advanced Learner's Dictionary

 

buttoned-up

 adjective
adjective
BrE BrE//ˌbʌtnd ˈʌp//
 
; NAmE NAmE//ˌbʌtnd ˈʌp//
 
(informal, especially British English)
 
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not expressing your emotions openly
See the Oxford Advanced American Dictionary entry: buttoned-up