be on the hush-hush

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be on the hush-hush

To be in a state of secrecy or minimal public knowledge; to be known only by a select few people. I need to tell you some important news, but it has to be on the hush-hush for a while. Apparently it's on the hush-hush, but I just found out John and Tracey are getting married soon!
See also: on