Definitions from Wiktionary (best-kept secret)
▸ noun: (idiomatic) Something interesting or important but not well-known.
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▸ noun: (idiomatic) Something interesting or important but not well-known.
Similar:
open secret,
secret,
nonsecret,
pseudosecret,
off-market,
small wonder,
road less traveled,
unmentionable,
none of someone's business,
hidden asset,
more...
Opposite:
Types:
▸ Words similar to best-kept secret
▸ Usage examples for best-kept secret
▸ Idioms related to best-kept secret
▸ Wikipedia articles (New!)
▸ Words that often appear near best-kept secret
▸ Rhymes of best-kept secret
▸ Invented words related to best-kept secret