(1)物や人を見張る人
(2)歩哨の仕事をすること
(3)the duty of serving as a sentry; "he was on guard that night"
(4)a person who keeps watch over something or someone
さらに詳しく
(1)２名で任務にあたる歩哨。
(2)a person who keeps watch over something or someone
