κοινό μυστικό

 

In the Greek data from the ILSP corpus, there are 143 citations for κοινό μυστικό, and only two for ανοικτό μυστικό.

In the Bank of English data, there is 1 citation for common secret, and 206 for open secret.

 

Interestingly therefore, while a direct equivalent might be said to exist (if you believe that words and phrases exist), the translator has chosen to go for what is more "normal" in English.

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