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on duty

adjective

Roget 680: doing etc. v.; acting; in action; in harness; on duty; in operation etc. 170.   

Roget 682: active, brisk, brisk as a lark, brisk as a bee; lively, animated, vivacious; alive, alive and kicking; frisky, spirited, stirring.    nimble, nimble as a squirrel; ... show more

Moby thesaurus: at it, at work, busy, employed, engaged, full of business, hard at it, hard at work, in harness, occupied, on the go, on the hop, on the job, on the jump, on the move, on the run, tied up, working.

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