close-mouthed /ˌkləʊs ˈmaʊðd◂, -ˈmaʊθt◂ $ ˌkloʊs-/ BrE AmE ( also closed mouthed /ˌkləʊzd- $ ˌkloʊzd-/ American English ) adjective
not willing to say much because you are trying to keep a secret SYN tight-lipped
close-mouthed /ˌkləʊs ˈmaʊðd◂, -ˈmaʊθt◂ $ ˌkloʊs-/ BrE AmE ( also closed mouthed /ˌkləʊzd- $ ˌkloʊzd-/ American English ) adjective
not willing to say much because you are trying to keep a secret SYN tight-lipped
Longman Dictionary of Contemporary English. Longman - Словарь современного английского языка. 2012