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in tandem

Definition

at the same time: The heart and lungs will be transplanted in tandem.Simultaneous and consecutiveOrder and sequence If two pieces of equipment, people, etc. are working in tandem, they are working together, especially well or closely: I want these two groups to work/operate in tandem on this project.Acting, being or existing together
(Definition of in tandem from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)