sentinel
US /ˈsen.t̬ɪ.nəl/
UK /ˈsen.t̬ɪ.nəl/
1.
schildwacht
a soldier or guard whose job is to stand and keep watch.
1.
schildwacht
station a soldier or guard by (a place) to keep watch.
:
•
a wide course had been roped off and sentineled with police