104 entries under idiom topic. ×

10
off the record(expression, adjective, intimate, personal)
5
buck private(noun, expression)
4
not for publication(expression, adjective, secret, confidential)
4
common soldier(noun, expression)
4
private soldier(noun, expression, service, combatant)
3
enlisted man(noun, expression)
3
in private(expression, mysterious, secret, reticent)
3
in secret(expression, concealment)
3
on the sly(expression, secret, hidden, sneaky)
2
behind closed doors
2
under one's hat(expression, adjective, adverb, intimate)
1
6th heavenly stem
1
behind the scenes(expression, adjective, intimate, personal)
1
first class(noun, expression)
1
foot soldier(expression, combatant)
1
in petto(expression, concealment)
1
in the dark(expression, mysterious, reticent, unknown)
1
making it with(expression, adjective, familiar, loving)
1
middle of nowhere(expression, unknown, isolated, reclusive)
1
off the beaten track(expression, close, quiet, remote)
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APASmart Define. (2016). private thesaurus. Retrieved September 24, 2026, from https://smartdefine.org/private/thesaurus/synonyms
ChicagoSmart Define. 2016. "private thesaurus" https://smartdefine.org/private/thesaurus/synonyms (accessed September 24, 2026).
HarvardSmart Define 2016, private thesaurus, Smart Define, viewed 24 September, 2026, <https://smartdefine.org/private/thesaurus/synonyms>.
MLASmart Define. "private thesaurus" 26 February 2016. Web. 24 September 2026. <https://smartdefine.org/private/thesaurus/synonyms>