| busy(adjective, active, occupied, working, engaged) |
| active(adjective, movement, moving, lively, effective) |
| on task |
| going(adjective, moving, active, effective, running) |
| working(adjective, active, full, busy, effective) |
| functioning(adjective, moving, active, effective, running) |
| on duty(expression, adjective, active, occupied, working) |
| operating(adjective, moving, active, occupied, alive) |
| engaged(adjective, lively, active, full, busy) |
| in the works(expression, idiom) |
| at it(expression, active, occupied, working, engaged) |
| employed(adjective, lively, active, full, involved) |
| going on |
| in force(expression, adjective, active, effective, alive) |
| in operation |
| in process(expression, adjective, active, effective, alive) |
| in progress(expression, engaged, leading-edge) |
| occupied(adjective, lively, active, full, working) |
| on the go(expression, idiom, active, occupied, working) |
| on the job(expression, adjective, idiom, busy, occupied) |