To transport away.
I need a truck to carry off all this furniture.
To steal or kidnap
Bandits carried off most of the money.
To act convincingly; to succeed at giving the impression of (e.g.) knowledge, confidence, or familiarity.
The actress carried off a difficult performance.
To cause the death of.
Malaria carried off many people.
To win (a prize, etc.).
After a closely-fought match, Oxford carried off the trophy.