Definition of hush-hush in English:

hush-hush

Syllabification: hush-hush

adjective

informal
(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.

Definition of hush-hush in:

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Pronunciation: fləˈjiSHəs
adjective
(of a person or their actions) criminal; villainous