picket line ( synonym found)
Definition of picket line:

°A line or rope held by one or many pickets, chiefly one used for tethering horses.
°A barrier or fortification formed by pickets; a stockade.
Definition of picket line:

°A line or rope held by one or many pickets, chiefly one used for tethering horses.
°A barrier or fortification formed by pickets; a stockade.
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