worst-kept secret

English

Noun

worst-kept secret (plural worst-kept secrets)

  1. (idiomatic) A situation where little or no attempt has been made to keep a matter secret.
    Antonym: best-kept secret
    • 2025 February 5, Peter Plisner, “East West Rail: progress from west to east”, in RAIL, number 1028, page 30:
      Late last year, the first test train ran on the line - a Class 165 diesel multiple unit provided by Chiltern Railways. It provided yet another clear indication to what seems to be one of the worst-kept secrets on the railways - that Chiltern will be the operator of EWR services.
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