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  1. hush-hush

    • IPA[ˈˌhəSH ˈˌhəSH]

    美式

    • adj.
      (especially of an official plan or project) highly secret or confidential
    • 釋義

    形容詞

    • 1. informal (especially of an official plan or project) highly secret or confidential a hush-hush research unit