1
general::
cordon sth/somewhere off
[ M ]
If people in authority, such as the police, cordon off a building or area, they put something around it in order to stop people from entering it
• They've cordoned off the whole area because of a suspected bomb.
Cambridge-Phrasal Verbs
2
general::
noun ADJ. tight | police, security VERB + CORDON form, throw Police officers threw a cordon around his car to protect him. | break through The crowd managed to break through the police cordon. CORDON + VERB prevent sth A police cordon prevented the marchers from entering the main square. PREP. ~ around/round There is a tight security cordon around the area.
Oxford Collocations Dictionary