Meaning of “mailbag” in the English Dictionary

"mailbag" in Business English

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mailbagnoun [ C ]

uk /ˈmeɪlbæɡ/ us COMMUNICATIONS

a large bag used for transporting mail on a truck, plane, etc.

US a bag containing mail that is carried by someone whose job is taking mail to homes and offices

US →  postbag

(Definition of “mailbag” from the Cambridge Business English Dictionary © Cambridge University Press)