cordon
n. countablen. a line of police officers, soldiers, or tape that stops people from entering an area. It is usually set up for safety or to protect a crime scene.
n. a line of people or objects stationed around an area to enclose or guard it. Often used in the context of security, law enforcement, or military operations to restrict access.
The police formed a cordon around the building.
After the gas leak was reported, authorities established a strict cordon to keep residents at a safe distance.
The security forces maintained a tight cordon around the embassy throughout the night to prevent protesters from breaching the perimeter during the high-profile summit.
From Middle English cordon, from Middle French cordon, from Old French cordon, diminutive of corde. More at cord.
Commonly used with the verbs 'form', 'establish', or 'break through'.