on duty
https://gyazo.com/aacee8356094e5a90fc49c3a0159a2ee
source:
Tuesday Anime: Summer Wars - Album on Imgur
on
duty
(or
off duty
)
engaged
(or
not
engaged
) in one's
regular
work
:
〈看護師･警察官などが〉当直［非番］で, 勤務時間中［外］で
e.g.
the doorman had gone off duty and the lobby was unattended.
#collocation