cordon off

phrasal verb·1 sense·particle off

Meanings

1

Close off an area to keep people out, usually by setting up a barrier

Why “off”? A piece detaches from the whole. Contact with the body is broken.

Police cordoned off the street.
Police closed off the street with a barrier to keep people out.
The fire crew cordoned off the gas leak.
The fire crew set up a barrier around the gas leak.

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