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Dictionary

nod

Pronunciation: (nod), [key]
—v., nod•ded, nod•ding,
—n.

—v.i.
1. 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, esp. 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.

—v.t.
1. to bend (the head) in a short, quick downward movement, as of assent or greeting.
2. to express or signify by such a movement of the head: to nod approval; to nod agreement.
3. to summon, bring, or send by a nod of the head.
4. to cause (something) to lean or sway; incline.
5. nod off, to fall asleep or doze, esp. in a sitting position: He was reprimanded for nodding off in class.
6. nod out, Slang.to fall asleep owing to the effects of a dose of a narcotic analgesic drug.

—n.
1. a short, quick downward bending forward of the head, as in assent, greeting, or command or because of drowsiness.
2. a brief period of sleep; nap.
3. a bending or swaying movement.
4. give the nod to, Informal.to express approval of; agree to: The board gave the nod to the new proposal.
5. on the nod,
a. Brit. Slang.on credit.
b. Slang.drowsy following a dose of a narcotic drug.