nod

verb9

1. •
   To incline the head up and down, as to indicate agreement.
2. •
   To briefly incline the head downwards as a cursory greeting.
3. •
   To signify by a nod.

   • They nodded their assent.
4. •
   To gradually fall asleep.
5. •
   (slang) To fall asleep while under the influence of opiates.
6. •
   (figurative) To allude to something.
7. •
   To head; to strike the ball with one's head.

   • Jones nods the ball back to his goalkeeper.
8. •
   To sway, move up and down.

   • By every wind that nods the mountain pine. — 1818
9. •
   To make a mistake by being temporarily inattentive or tired

   • Even Homer nods.

noun5

1. •
   An instance of inclining the head up and down, as to indicate agreement, or as a cursory greeting.
2. •
   (figurative) Approval.

   • The plan is expected to get the nod from councillors at the next meeting.
3. •
   A reference or allusion to something.
4. •
   A nomination.

   • For the fifth time in her career she received a Grammy nod, she has yet to win the award.
5. •
   A state of half-consciousness; stupor.

   • Withered addicts drooped into chronic heroin nods. — 1988

noun2

1. •
   (US) Initialism of Night Optical/Observation Device.
2. •
   Initialism of notice Of disagreement; filed by an appellant in response to a denial of veteran's benefits in United States law.