Block off and Closing off

Block off verb - To disallow entry into (a place) by means of a physical barrier at the entry point.

Closing off is a synonym for block off. In some cases you can use "Closing off" instead a verb "Block off".

Closing off noun - The act of isolating something; setting something apart from others.

Block off is a synonym for closing off in isolate topic. You can use "Block off" instead a verb "Closing off", if it concerns topics such as cut off.