Definition of secret service noun from the Oxford Advanced Learner's Dictionary


secret service

BrE BrE//ˌsiːkrət ˈsɜːvɪs//
; NAmE NAmE//ˌsiːkrət ˈsɜːrvɪs//
[usually singular]
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a government department that is responsible for protecting its government’s military and political secrets and for finding out the secrets of other governments
See the Oxford Advanced American Dictionary entry: secret service