in harness
US /ɪn ˈhɑːrnɪs/
UK /ɪn ˈhɑːrnɪs/

1.
在职, 投入工作, 在岗位上
working or performing one's duties, especially after a period of rest or inactivity
:
•
After a long vacation, it's good to be back in harness.
长假过后,很高兴能重新投入工作。
•
The old politician was still in harness, actively participating in debates.
这位老政治家仍然在职,积极参与辩论。