Definitions from Wiktionary ( )

▸ noun:  A stake driven into the ground.
▸ noun:  (historical) A type of punishment by which an offender had to rest his or her entire body weight on the top of a small stake.
▸ noun:  A tool in mountaineering that is driven into the snow and used as an anchor or to arrest falls.
▸ noun:  (military) One of the soldiers or troops placed on a line forward of a position to warn against an enemy advance; or any unit (for example, an aircraft or ship) performing a similar function.
▸ noun:  (sometimes figurative) A sentry.
▸ noun:  A protester positioned outside an office, workplace etc. during a strike (usually in plural); also the protest itself.
▸ noun:  (card games, uncountable) The card game piquet.
▸ verb:  (intransitive) To protest, organized by a labour union, typically in front of the location of employment.
▸ verb:  (transitive) To enclose or fortify with pickets or pointed stakes.
▸ verb:  (transitive) To tether to, or as if to, a picket.
▸ verb:  (transitive) To guard, as a camp or road, by an outlying picket.
▸ verb:  (obsolete, transitive) To torture by forcing to stand with one foot on a pointed stake.

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