Question

what does shoulder mean here?
dirk shifted the car into reverse, glanced over his shoulder, and then slowly backed out of the driveway.
shoulder noun the part of your body that connects the arm to the torso
shoulder verb to accept and bear a burden or responsibility

Explanation:

In the sentence "Dirk shifted the car into reverse, glanced over his shoulder, and then slowly backed out of the driveway", "shoulder" refers to the body part that connects the arm to the torso. The context of glancing over the shoulder (a body movement) supports this meaning, while the verb meaning of accepting a burden doesn't fit here.

Answer:

shoulder noun the part of your body that connects the arm to the torso