"pickets" in the noun sense
1. lookout, lookout man, sentinel, sentry, watch, spotter, scout, 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
5. picket, pale
a wooden strip forming part of a fence
6. picket, piquet
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
"pickets" in the verb sense
serve as pickets or post pickets
"picket a business to protest the layoffs"
fasten with a picket
"picket the goat"
Source: WordNet® (An amazing lexical database of English)
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