82 entries under expression topic. ×
| fifth column(noun, secret, subway, subversives) | |
| under wraps(adjective, idiom, secret, hidden) | |
| in a cloud(idiom, concealment) | |
| in a fog(idiom, concealment) | |
| in the dark(idiom, concealment) | |
| under an eclipse(idiom, concealment) | |
| wrapped in clouds(idiom, concealment) | |
| agreement to disagree | |
| at odds with | |
| at variance with | |
| behind the curtain | |
| behind the scenes | |
| behind the veil | |
| in a corner | |
| in a whisper | |
| in the background | |
| in the wings | |
| nobody the wiser | |
| resting in peace | |
| under house arrest |
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| APA | Smart Define. (2015). underground thesaurus. Retrieved September 21, 2026, from https://smartdefine.org/underground/thesaurus/synonyms |
| Chicago | Smart Define. 2015. "underground thesaurus" https://smartdefine.org/underground/thesaurus/synonyms (accessed September 21, 2026). |
| Harvard | Smart Define 2015, underground thesaurus, Smart Define, viewed 21 September, 2026, <https://smartdefine.org/underground/thesaurus/synonyms>. |
| MLA | Smart Define. "underground thesaurus" 3 November 2015. Web. 21 September 2026. <https://smartdefine.org/underground/thesaurus/synonyms> |