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English definition of “be at work”

be at work

to be working: The labourers were at work in the fields.Work, working and the workplaceWorking hours and periods of workBusy and activeHurrying and doing things quickly literary to be having an effect, usually an obvious or bad effect: It seems as though forces of destruction are increasingly at work throughout society.Occurring and happening
(Definition of be at work from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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