To continue or proceed as before.
I'll be gone for a few days, but I hope you will carry on in my absence.
To take baggage or luggage onto an airplane, rather than check it.
You may only carry on items that are smaller than a certain size.
To have or maintain.
It is difficult to carry on a conversation with so many distractions.
To act or behave; especially to misbehave so as to attract attention.
I really wish you wouldn't carry on like that in public!
To have an illicit sexual or flirtatious relationship.
I thought he was my friend, but all the time he was carrying on with my wife!