Definitions from Wiktionary (picket line)

▸ noun:  (rare) A line or rope held by one or many pickets, chiefly one used for tethering horses.
▸ noun:  (military, rare) A barrier or fortification formed by pickets; a stockade.
▸ noun:  (military) A boundary guarded by a picket (unit of soldiers).
▸ noun:  A boundary created by workers participating in a strike, generally at the workplace entrance, which other workers are asked not to pass.
▸ Also see picket_line


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