closely guarded secret
 

* 1.hidden secret

2.secret which is protected

English Related Words* an open secret

* armenian secret army for the liberation of armenia

* be in on the secret

* be in the secret

* best-kept secret

* betray a secret

* can keep a secret

* closely

* closely attached

* closely held

* closely held company

* closely held corporation

* closely knit

* closely packed

* closely resembles