Move the head to indicate yes
• To bend or incline the upper part, with a quick motion; as, nodding plumes. • To incline the head with a quick motion; to make a slight bow; to make a motion of assent, of salutation, or of drowsiness, with the head; as, to nod at one. • To be drowsy or dull; to be careless. • To incline or bend, as the head or top; to make a motion of assent, of salutation, or of drowsiness with; as, to nod the head.