52 entries under expression topic. ×
| what for(verb, phrasal verb) | |
| closed book(noun, trouble, challenge, question) | |
| how come | |
| why and wherefore(noun, idiom, cause, start) | |
| for which | |
| reason why(idiom, cause) | |
| tough nut to crack(idiom, question, secret, puzzle) | |
| chapter and verse(noun, idiom, information, cause) | |
| for what reason | |
| from what cause | |
| paper trail(noun, information, reason, picture) | |
| sixty-four-thousand-dollar question(difficulty, question, secret, puzzle) | |
| sixty-four dollar question | |
| smoking gun(noun, information, reason, picture) | |
| straight stuff(noun, information, cause, reason) | |
| tot's repeated query | |
| nut to crack | |
| on what account | |
| by end(idiom, motive) | |
| by jingo(idiom, affirmation) |
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| APA | Smart Define. (2016). why thesaurus. Retrieved September 22, 2026, from https://smartdefine.org/why/thesaurus/synonyms |
| Chicago | Smart Define. 2016. "why thesaurus" https://smartdefine.org/why/thesaurus/synonyms (accessed September 22, 2026). |
| Harvard | Smart Define 2016, why thesaurus, Smart Define, viewed 22 September, 2026, <https://smartdefine.org/why/thesaurus/synonyms>. |
| MLA | Smart Define. "why thesaurus" 2 February 2016. Web. 22 September 2026. <https://smartdefine.org/why/thesaurus/synonyms> |