Longman Dictionary of Contemporary English homepage

picket line

 noun
     
picket line [countable]
a group of people who stand outside a factory and try to prevent people from going in or coming out during a strike
on a picket line
So far, there has been very little violence on the picket line.
Very few workers were willing to cross the picket line.
Definition from the Longman Dictionary of Contemporary English
Advanced Learner's Dictionary.

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