Definitions from Wiktionary ( )

▸ verb:  (ambitransitive) To incline the head up and down, as to indicate agreement.
▸ verb:  (ambitransitive) To briefly incline the head downwards as a cursory greeting.
▸ verb:  (ambitransitive) To sway, move up and down.
▸ verb:  (intransitive) To gradually fall asleep.
▸ verb:  (transitive) To signify by a nod.
▸ verb:  (intransitive) To make a mistake by being temporarily inattentive or tired
▸ verb:  (transitive, intransitive, soccer) To head; to strike the ball with one's head.
▸ verb:  (intransitive, figuratively) To allude to something.
▸ verb:  (intransitive, slang) To fall asleep while under the influence of opiates.
▸ noun:  An instance of inclining the head up and down, as to indicate agreement, or as a cursory greeting.
▸ noun:  A reference or allusion to something.
▸ noun:  A nomination.
▸ noun:  (figurative) Approval.
▸ noun:  A state of half-consciousness; stupor.
▸ noun:  (law) Initialism of notice Of disagreement; filed by an appellant in response to a denial of veteran's benefits in United States law.
▸ noun:  (military, US) Initialism of Night Optical/Observation Device.

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