only 1 use
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- She looked left and right, she slipped cautiously into a speed of two miles an hour, beseeching Amory to act as sentinel; and at one busy crossing she made him get out and run ahead to signal her forward like a traffic policeman.1.1 — Amory, Son of Beatrice (50% in)
There are no more uses of "sentinel" in This Side of Paradise.
Typical Usage (best examples)