58 entries under idiom topic. ×
| not known(expression, adjective, evil, deep) | |
| off the beaten track(expression, close, quiet, remote) | |
| on the QT(expression, adjective, dishonest, private) | |
| on the quiet(expression, dishonest, cunning, deceitful) | |
| out of earshot(expression, obscure, remote, faraway) | |
| out of range(expression, obscure, remote, faraway) | |
| out of reach(expression, obscure, remote, faraway) | |
| skeleton in cupboard(noun, expression, confidence, perplexity) | |
| tough nut to crack(expression, question, puzzle, mystery) | |
| under an eclipse | |
| under false pretense(expression, adjective, sensitive, clandestine) | |
| under house arrest | |
| under one's hat(expression, adverb) | |
| wrapped in clouds | |
| inside information(noun, expression, information) | |
| causing dejection | |
| classified material | |
| cloak and dagger(expression, quiet, intriguing) | |
| communicated covertly | |
| crucial point |
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| APA | Smart Define. (2016). secret thesaurus. Retrieved September 28, 2026, from https://smartdefine.org/secret/thesaurus/synonyms |
| Chicago | Smart Define. 2016. "secret thesaurus" https://smartdefine.org/secret/thesaurus/synonyms (accessed September 28, 2026). |
| Harvard | Smart Define 2016, secret thesaurus, Smart Define, viewed 28 September, 2026, <https://smartdefine.org/secret/thesaurus/synonyms>. |
| MLA | Smart Define. "secret thesaurus" 31 March 2016. Web. 28 September 2026. <https://smartdefine.org/secret/thesaurus/synonyms> |