What is the meaning of the term invert?

The term "invert" refers to the action of turning something inside out or upside down. Specifically, in the context of movement or anatomy, to invert means to turn inward, as in the case of certain body parts or objects being flipped in a way that their inner surfaces are exposed or facing inward. This concept is frequently used in various fields, including biology, where it might describe the movement of feet or limbs towards the body's midline.

The other definitions do not align with the widely accepted usage of the term. Turning outward indicates a movement away from the center, bending backward suggests a different type of motion altogether, and being farther from the median describes a position rather than a directional action. Thus, the most accurate interpretation of "invert" in this context is indeed to turn inward.