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English definition of “postbag”

postbag

noun [U]
 
 
/ˈpəʊstbæɡ/ UK ( US mailbag) COMMUNICATIONS
the number of letters received at one time or on one subject: Travel received the second highest number of complaints in the consumer watchdog's postbag of 350,000 letters a year.
(Definition of postbag from the Cambridge Business English Dictionary © Cambridge University Press)
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