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English definition of “postbag”

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postbag

noun uk   /ˈpəʊst.bæɡ/ us    /ˈpoʊst-/ UK ( UK also and US mailbag)
[U] the number of letters received at one time or on one subject: It was clear from our postbag that viewers were unhappy about the programme. [C] a large strong bag used by the Post Office for transporting and carrying letters and parcels
(Definition of postbag from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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