picket line
Pronunciation:
/ˈpɪkɪt laɪn//ˈpɪkɪt ˌlaɪn/noun
Definitions
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.
A boundary guarded by a picket (unit of soldiers).
A boundary created by workers participating in a strike, generally at the workplace entrance, which other workers are asked not to pass.