picket line
 警戒線,糾察線


 Pick·et n.
 1. A stake sharpened or pointed, especially one used in fortification and encampments, to mark bounds and angles; or one used for tethering horses.
 2. A pointed pale, used in marking fences.
 3.  Mil. A detached body of troops serving to guard an army from surprise, and to oppose reconnoitering parties of the enemy; -- called also outlying picket.
 4. By extension, men appointed by a trades union, or other labor organization, to intercept outsiders, and prevent them from working for employers with whom the organization is at variance. [Cant]
 5. A military punishment, formerly resorted to, in which the offender was forced to stand with one foot on a pointed stake.
 6. A game at cards. See Piquet.
 Inlying picket Mil., a detachment of troops held in camp or quarters, detailed to march if called upon.
 Picket fence, a fence made of pickets. See def. 2, above.
 Picket guard Mil., a guard of horse and foot, always in readiness in case of alarm.
 Picket line. Mil. (a) A position held and guarded by small bodies of men placed at intervals. (b) A rope to which horses are secured when groomed.
 Picketpin, an iron pin for picketing horses.


 picket line
      n : a line of people acting as pickets