The idiomatic expression "to toe the line" means to conform to rules or standards. For example, you could use it in a sentence like "It is important for employees to toe the line when it comes to following company policies and procedures."

as long as you toe the chalk line means to do as you are told and behave well

To toe the line, or toe the chalk line, is to follow orders and do what you are told. In some circumstances people are asked to stand in front of a line (which may or may not be drawn in chalk) with their toes at the line. If people do that, it is an indication of obedience.

An angulated fracture is one in which the bones, once broken, no longer line up in the straight line they used to assume, and have broken into an angle. The fifth toe is the little toe.

Toe the line