noun a person employed to keep watch for some anticipated event.
— synonyms: lookout, lookout_man, sentinel, sentry, watch, spotter, scout
noun a detachment of troops guarding an army from surprise attack.
noun a protester posted by a labor organization outside a place of work.
noun a vehicle performing sentinel duty.
noun a wooden strip forming part of a fence.
— synonyms: pale
noun a form of military punishment used by the British in the late 17th century in which a soldier was forced to stand on one foot on a pointed stake.
— synonyms: piquet