Meaning of “picket” - Learner’s Dictionary

picket

noun [ C ] us uk /ˈpɪkɪt/ also picket line, us

a group of people who stand outside a building in order to show their anger about something and to try to stop people going inside

picket verb [ I, T ]

Protesters picketed cinemas across the whole country.

(Definition of “picket” from the Cambridge Learner’s Dictionary © Cambridge University Press)