Block off and Close in

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

Close in and block off are semantically related in enclose topic. In some cases you can use "Close in" instead a verb "Block off", when it comes to topics like surround.

Close in verb - To come near or nearer.

Block off and close in are semantically related in enclose topic. Sometimes you can use "Block off" instead a verb "Close in", if it concerns topics such as surround.