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English definition of “up”

up

adjective [after verb]     /ʌp/ IT
if a computer, system, etc. is up, it is operating normally: The system is up again, so we have to get back to work. Do you know when the network will be up again? → Compare down adjective
up and running if a computer, machine, or system is up and running, it is operating normally: The air-conditioning is up and running again after two days of problems.
(Definition of up adjective from the Cambridge Business English Dictionary © Cambridge University Press)
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