|Origin:||piquet, from piquer 'to prick'|
when a group of people stand or march in front of a shop, factory, government building etc to protest about something or to stop people from going in during a strike:
There was a mass picket (=one involving a lot of people) by students outside the main office of the university.
They organized a picket of the power station.
a person or the group of people involved in a picket: ➔ flying picket
The pickets persuaded some drivers not to enter the factory.
a soldier or a group of soldiers with the special duty of guarding a military camp:
He's on picket duty tonight.