British term for the bag a postal worker carries to deliver mail, but it's also widely used in a figurative sense to describe the volume of letters, emails, or messages received — especially by public figures, broadcasters, or politicians. When a TV presenter says they've received a 'huge postbag' on a topic, they mean they got an overwhelming response from viewers. It's a handy word for talking about audience or reader feedback at scale.
The MP's postbag was flooded with letters after the controversial vote.
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(British) A bag used for carrying post (mail).
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