To limit narrowly; to restrict.
To draw the smallest circle or higher-dimensional sphere that has (a polyhedron, polygon, etc.) in its interior.
To draw a line around; to encircle.
To free from a constraint.
To loosen or undo (something that entangles, fastens, holds, or interlocks).
To free (someone or something) from a constraint; (figuratively) to release (something which has been suppressed, such as emotions or objectionable things).
To relax or slacken (something that clasps or grips, such as the arms or hands).
To become loose or come off.