Definition of close-mouthed adjective from the Oxford Advanced American Dictionary

 

close-mouthed

 adjective
adjective
NAmE//ˈkloʊz maʊθt//
 
, NAmE//ˈkloʊs maʊðd//
 
[not usually before noun]
 
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not willing to say much about something because you want to keep a secret
See the Oxford Advanced Learner's Dictionary entry: close-mouthed