Definition of "Picket" :

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

noun: a wooden strip forming part of a fence

noun: a vehicle performing sentinel duty

noun: a detachment of troops guarding an army from surprise attack

noun: a person employed to keep watch for some anticipated event

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

verb: fasten with a picket

"Picket the goat."

verb: serve as pickets or post pickets

"Picket a business to protest the layoffs."