noun
a line or circle of police, soldiers, or guards preventing access to or from an area
verb
to form a cordon around or enclose with a cordon
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The police set up a cordon around the crime scene to preserve evidence.
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They put up a cordon so no one could get through.
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The concert was so crowded, we had to break through the cordon to get closer to the stage.
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The cordon of security guards protected the VIP guests at the event.