v.1. To trap or confine someone or something in a limited space or region: We boxed in the left corner of the living room with a new wall and curtains. The enemy forces had boxed us in on all sides.
2. To prevent someone from acting freely, usually by creating restrictions or obstacles: Being too strict will box in your students and prevent them from being creative. I want to make some changes at the office, but my boss has boxed me in with too many rules.