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