verb
constrain
kun-STRAYN/kənˈstreɪn/
To restrict the range of permitted action.
The narrow frame and tight ties constrain the young tree's growth.

Etymology
The pieces describe binding tightly together, as with fetters or chains. That physical restriction supplies the image for limiting someone's actions or forcing something within bounds.
In context
laws are really powerless to constrain the actions of an organized minority of people who want to subvert them
More examples
- Our small budget constrains our travel plans.
- The architect was constrained by the narrow lot.
- They avoid constraining students to a single approach.
Forms
constrain · constrains · constrained · constraining
constraint noun — A limit on available choices or actions.