Definition of hush-hush in English:
(Especially of an official plan or project) highly secret or confidential: a hush-hush research unit
More example sentences
- Main is also working on a hush-hush project involving a Scottish-based online games business and a couple of high-profile sports journalists.
- The top-secret project was so hush-hush they were barred from even taking photographs.
- A lot of the game world is top secret and hush-hush.
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