Definition of backpack noun from the Oxford Advanced Learner's Dictionary



    BrE BrE//ˈbækpæk//
    ; NAmE NAmE//ˈbækpæk//
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  1. 1(British English also rucksack) a large bag, often supported on a light metal frame, carried on the back and used especially by people who go climbing or walking She swung her backpack over her shoulder. He was wearing a heavy backpack. See related entries: Camping
  2. 2a piece of equipment that is carried on the back a weed-sprayer backpack In the study, birds were fitted with a 28g backpack radio transmitter.
See the Oxford Advanced American Dictionary entry: backpack

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