I. ˈcarry-on 1 BrE AmE noun [countable]
1 . British English spoken a situation in which someone behaves in a silly or annoying way:
What a carry-on!
2 . American English a bag that you are allowed to take onto a plane with you
⇨ carry on at ↑ carry 1
II. carry-on 2 BrE AmE adjective [only before noun]
carry-on bags are ones that you are allowed to take onto a plane with you