verb / noun
confine
kun-FYNE/kənˈfaɪn/
To keep within a bounded space or range.
The playpen confines the puppy to a safe area with water and toys.

Etymology
French confiner covered both bordering and enclosing. English first used confine for sharing a boundary, then for keeping someone or something within boundaries—the restrictive meaning used here.
In context
to confine them in solitary in without companionship without the ability to go more than tens of meters
More examples
- Please confine your comments to the proposed changes.
- The firefighters confined the blaze to one room.
- We work within the confines of a small office.
Forms
confine · confines · confined · confining
confinement noun — The state of being kept within limits.