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letter box(noun, expression, idiom, mailbox)
For more, visit Letterbox on Power Thesaurus
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APASmart Define. (2013). letterbox thesaurus. Retrieved September 24, 2026, from https://smartdefine.org/letterbox/thesaurus/synonyms
ChicagoSmart Define. 2013. "letterbox thesaurus" https://smartdefine.org/letterbox/thesaurus/synonyms (accessed September 24, 2026).
HarvardSmart Define 2013, letterbox thesaurus, Smart Define, viewed 24 September, 2026, <https://smartdefine.org/letterbox/thesaurus/synonyms>.
MLASmart Define. "letterbox thesaurus" 17 June 2013. Web. 24 September 2026. <https://smartdefine.org/letterbox/thesaurus/synonyms>