picket

a person employed to keep watch for some anticipated event

a detachment of troops guarding an army from surprise attack

a protester posted by a labor organization outside a place of work

a vehicle performing sentinel duty

a wooden strip forming part of a fence

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

serve as pickets or post pickets; "picket a business to protest the layoffs"

fasten with a picket; "picket the goat"