Wiktionary
vb. To protect from intrusion by enclosing in a rope barrier.
WordNet
Usage examples of "cordon off".
They consist of a battle-ready battalion that will cordon off Vladimir.
The Wehrmacht is becoming stingier all the time about this, just as it won't ever provide enough soldiers to cordon off a work area.
The Masqat garrison will cordon off the area and no one but our people will be allowed inside.
The first place that the cops cordon off is the airport, followed by the highways, followed, as a distinct afterthought, by the seaways.
He finished by saying that he'd heard shots fired and that they'd better cordon off the neighborhood and get a team ready to send in.
Since we didn't have time to coordinate this strike, do me a favor, get hold of the administrator of the airport and the sheriff's department, and cordon off the airport.
A security guard who was trying to cordon off the area shouted at him as he ran past.
You get Mike and Curtis from the plant crew, and we'll cordon off the area.