Noun mailbag has 2 senses
  1. mailbag, mail pouch - pouch used in the shipment of mail
    --1 is a kind of pouch
    --1 has particulars: diplomatic pouch
  2. mailbag, postbag - letter carrier's shoulder bag; "in England they call a mailbag a postbag"
    --2 is a kind of bag
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