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up

adjective [after verb] (IN OPERATION)
 
 
/ʌp/

Definition

When a system, computer, or similar machine is up, it is operating, especially in its usual way: Andy, do you know when the network will be up again? → Opposite downFunctioningPerforming a functionComputer concepts
(Definition of up adjective (IN OPERATION) from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)

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