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Adjective:
on duty
Actively
engaged
in
work
or
service
;
currently
responsible for
a
particular
task
or
role
"The
nurse
is on
duty
from 8 AM to 8 PM"
on and on
on appro
on approval
on average
on balance
on board
on call
on camera
on cloud nine
on demand
on duty
on earth
on edge
on end
on faith
on fire
on fleek
on guard
on hand
on hold
on ice