n a person employed to keep watch for some anticipated event
n a detachment of troops guarding an army from surprise attack
n a protester posted by a labor organization outside a place of work
n a vehicle performing sentinel duty
n a wooden strip forming part of a fence
n 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
v serve as pickets or post pickets
v fasten with a picket