be an open secret
イディオム1,045/1,085if sth is an open secret, many people know about it, although it is supposed to be a secret
2 本の映画に登場 · Maria Bamford: Old Baby
That's an open secret.
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イディオム · 1,045 / 1,085
if sth is an open secret, many people know about it, although it is supposed to be a secret