To incline the head up and down, as to indicate agreement.
To briefly incline the head downwards as a cursory greeting.
To sway, move up and down.
To gradually fall asleep.
To signify by a nod.
They nodded their assent.
To make a mistake by being temporarily inattentive or tired
To head; to strike the ball with one's head.
Jones nods the ball back to his goalkeeper.
To allude to something.
To fall asleep while under the influence of opiates.