58 entries under idiom topic. ×
| closed book(noun, expression, trouble, challenge) | |
| off the record(expression, adjective, separate, private) | |
| under wraps(expression, adjective, adverb, show) | |
| mystery story(noun, expression, mystery) | |
| not for publication(expression, adjective, sensitive, private) | |
| on the sly(expression, private, hidden, sneaky) | |
| out of sight | |
| behind the scenes(expression, personal, confidential, hush-hush) | |
| in secret | |
| behind the curtain | |
| hush hush | |
| in a cloud | |
| in a fog | |
| in the background(expression, obscure, remote, faraway) | |
| in the boonies(expression, obscure, remote, faraway) | |
| in the distance(expression, obscure, remote, faraway) | |
| in the sticks(expression, obscure, remote, faraway) | |
| in the wings | |
| middle of nowhere(expression, obscure, remote, faraway) | |
| mystery of mysteries |
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| APA | Smart Define. (2016). secret thesaurus. Retrieved September 26, 2026, from https://smartdefine.org/secret/thesaurus/synonyms |
| Chicago | Smart Define. 2016. "secret thesaurus" https://smartdefine.org/secret/thesaurus/synonyms (accessed September 26, 2026). |
| Harvard | Smart Define 2016, secret thesaurus, Smart Define, viewed 26 September, 2026, <https://smartdefine.org/secret/thesaurus/synonyms>. |
| MLA | Smart Define. "secret thesaurus" 31 March 2016. Web. 26 September 2026. <https://smartdefine.org/secret/thesaurus/synonyms> |