Lock up and Shut in

Lock up verb - To put in or as if in prison.

Shut in and lock up are semantically related in confine topic. In some cases you can use "Shut in" instead a verb "Lock up", when it comes to topics like enclose, surround, hold in enclosure.

Shut in verb - Surround completely.

Lock up and shut in are semantically related in confine topic. You can use "Lock up" instead a verb "Shut in", if it concerns topics such as enclose, surround, hold in enclosure.