Close off and Single out

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

Single out and close off are semantically related in isolate topic. In some cases you can use "Single out" instead a verb "Close off", when it comes to topics like discriminate and separate.

Single out verb - To decide to accept (someone or something) from a group of possibilities.

Close off and single out are semantically related in isolate topic. Sometimes you can use "Close off" instead a verb "Single out", if it concerns topics such as discriminate and separate.