Catch up and Close in

Catch up verb - To catch or hold as if in a net.

Close in and catch up are semantically related in come nearer topic. In some cases you can use "Close in" instead a verb "Catch up".

Close in verb - To come near or nearer.

Catch up and close in are semantically related in come nearer topic. Sometimes you can use "Catch up" instead a verb "Close in".