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English definition of “postbag”

postbag

noun     /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.The postal system [C] a large strong bag used by the Post Office for transporting and carrying letters and parcelsThe postal system
(Definition of postbag noun from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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