The phrase gives you a visual image of a single tree standing there, which combined with its location at the gate suggests the image of a sentinel or soldier on guard at a gate.
The term Sentinel can refer to a person or thing that watches or stands as if watching, or, more notably in this case a soldier stationed as a guard to challenge all comers and prevent a surprise attack. Basically, its a guard who stands watch to prevent a surprise attack.
Sentinel: A sentry or guard.
Sentinel or sentry.
watch, protector, guard, sentinel
sentinel
A sentinel is a person or a figure representing a god or Deity that is supposed to guard or protect something.
guard : sentinel
guard : sentinel
It is the first node in which the lymphatic drainage occura in a particular area.
A name too awesome for a definition!!! - Well I know that it means sentinel or guard in arabian.
A sentry.
Relief over finding the culprit but sympathy for the perpetrator is the way the sentinel seems to feel about arresting Antigone in "Antigone" by Sophocles (495 B.C.E. - 405 B.C.E.).Specifically, the sentinel stands guard over the unburied bodies of the disloyal Theban dead. He must make sure under pain of torture and death that the bodies remain exposed. He is relieved to be able to prove that he is not the perpetrator. But at the same time he appears sympathetic to Antigone's pain since he likens her to a mother bird finding her chicks gone from the nest.