to make a slight, quick downward bending forward of the head, as in assent, greeting, or command.
2.
to let the head fall slightly forward with a sudden, involuntary movement when sleepy.
3.
to doze, especially in a sitting position:
The speaker was so boring that half the audience was nodding.
4.
to become careless, inattentive, or listless; make an error or mistake through lack of attention.
5.
(of trees, flowers, plumes, etc.) to droop, bend, or incline with a swaying motion.
verb (used with object), nodded, nodding.
6.
to bend (the head) in a short, quick downward movement, as of assent or greeting.
7.
to express or signify by such a movement of the head:
to nod approval; to nod agreement.
8.
to summon, bring, or send by a nod of the head.
9.
to cause (something) to lean or sway; incline.
noun
10.
a short, quick downward bending forward of the head, as in assent, greeting, or command or because of drowsiness.
11.
a brief period of sleep; nap.
12.
a bending or swaying movement