Etymology
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picket (n.)

1680s, "pointed post or stake (usually of wood, for defense against cavalry, etc.)," from French piquet "pointed stake," from piquer "to pierce" (see pike (n.1)). Also "one of a number of pointed bars used to make a fence," hence picket-fence (1817). The sense of "troops posted in front of an army to give notice of the approach of the enemy" is recorded from 1761; that of "striking workers stationed to prevent others from entering a factory" is from 1867. Picket-line is by 1856 in the military sense, by 1945 of labor strikes.

picket (v.)

1745, "to enclose or fortify with pointed stakes," from picket (n.). Meaning "to place or post as a guard of observation" is by 1775. The sense in labor strikes, protests, etc., is attested from 1867. Related: Picketed; picketing.

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Definitions of picket
1
picket (n.)
a person employed to keep watch for some anticipated event;
Synonyms: lookout / lookout man / sentinel / sentry / watch / spotter / scout
picket (n.)
a detachment of troops guarding an army from surprise attack;
picket (n.)
a protester posted by a labor organization outside a place of work;
picket (n.)
a vehicle performing sentinel duty;
picket (n.)
a wooden strip forming part of a fence;
Synonyms: pale
picket (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;
Synonyms: piquet
2
picket (v.)
serve as pickets or post pickets;
picket a business to protest the layoffs
picket (v.)
fasten with a picket;
picket the goat
From wordnet.princeton.edu