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English definition of “carry-on”

carry-on

noun [C] (LUGGAGE)    /ˈkær.i.ɒn/ US  /ˈker.i.ɑːn/ (plural carry-ons) mainly US
a small case or bag that you take onto a plane with youBags in generalTravelling by aircraftAviationMovement through the air
(Definition of carry-on noun (LUGGAGE) from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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