noun
EXAMPLES FROM CORPUS
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Hundreds of trade unionists came day after day to support the Grunwick strikers on the picket line .
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Now get this: the other workers respected the picket line .
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The picket line was supplemented by daily long-range air patrols by naval aircraft.
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They shouted the news that the Confederates were making an attack on the picket line with a heavy force...
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Things are quiet on the picket line on this Sunday afternoon.