to limit something

Their movements have been severely circumscribed since the laws came into effect. 自从这些法律生效以来，他们的活动受到了严格约束。

There followed a series of tightly circumscribed visits to military installations. 随之而来的是对参观军事设施的一系列严格限制。

If you circumscribe a triangle, square, etc., you draw a circle that surrounds it and touches each of its corners.