in action; at one's place of employment
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At work Definition from Language, Idioms & Slang Dictionaries & Glossaries
Adjective
1. on the job; "had been at work for over an hour before her boss arrived"
(synonym) at work(p)
(similar) busy
2. having influence or producing an effect; "many emotional determinants at work"; "an operant conscience"
(synonym) at work(p), operant
(similar) operative
