An instance of inclining the head up and down, as to indicate agreement, or as a cursory greeting.

A reference or allusion to something.

A nomination.

(figurative) Approval.

(transitive, intransitive) To incline the head up and down, as to indicate agreement.

(transitive, intransitive) To briefly incline the head downwards as a cursory greeting.

(transitive, intransitive) To sway, move up and down.

(intransitive) To gradually fall asleep.

(transitive) To signify by a nod.

(intransitive) To make a mistake by being temporarily inattentive or tired

(transitive, intransitive, soccer) To head; to strike the ball with one's head.

(intransitive, figurative) To allude to something.

(intransitive, slang) To fall asleep while under the influence of opiates.