nod

[nod]
verb (used without object), nodded, nodding.
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, 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.
Verb phrases
13.
nod off, to fall asleep or doze, especially in a sitting position: He was reprimanded for nodding off in class.
14.
nod out, Slang. to fall asleep, especially owing to the effects of a drug.
Idioms
15.
give the nod to, Informal. to express approval of; agree to: The board gave the nod to the new proposal.
16.
on the nod,
a.
British Slang. on credit.
b.
Slang. drowsy following a dose of a narcotic drug.

Origin:
1350–1400; Middle English nodde, of uncertain origin

nodder, noun
noddingly, adverb
unnodding, adjective


3. drowse.
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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Collins
World English Dictionary
nod (nɒd)
 
vb , nods, nodding, nodded
1.  to lower and raise (the head) briefly, as to indicate agreement, invitation, etc
2.  (tr) to express or indicate by nodding: she nodded approval
3.  (tr) to bring or direct by nodding: she nodded me towards the manager's office
4.  (intr) (of flowers, trees, etc) to sway or bend forwards and back
5.  (intr) to let the head fall forward through drowsiness; be almost asleep: the old lady sat nodding by the fire
6.  (intr) to be momentarily inattentive or careless: even Homer sometimes nods
7.  nodding acquaintance a slight, casual, or superficial knowledge (of a subject or a person)
 
n
8.  a quick down-and-up movement of the head, as in assent, command, etc: she greeted him with a nod
9.  See also land of Nod a short sleep; nap
10.  a swaying motion, as of flowers, etc, in the wind
11.  informal on the nod
 a.  agreed, as in a committee meeting, without any formal procedure
 b.  (formerly) on credit
12.  informal boxing the nod the award of a contest to a competitor on the basis of points scored
 
[C14 nodde, of obscure origin]
 
'nodding
 
adj, —n

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Etymonline
Word Origin & History

nod
"to quickly bow the head," late 14c., of unknown origin, probably an O.E. word, but not recorded; perhaps related to O.H.G. hnoton "to shake," from P.Gmc. *khnudojanan. The noun is first attested 1540. Meaning "to drift in and out of consciousness while on drugs" is attested from 1968.
Online Etymology Dictionary, © 2010 Douglas Harper
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Easton
Bible Dictionary

Nod definition


exile; wandering; unrest, a name given to the country to which Cain fled (Gen.4:16). It lay on the east of Eden.

Easton's 1897 Bible Dictionary
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Example sentences
And she spent all of her first week of life nodding off under the heat lamp,
  then being startled back awake.
However, this column is not for the jaded tenured professors out there nodding
  their heads in agreement.
One could imagine many researchers nodding their heads.
He referred to my old-country habit of raising the hat in salutation instead of
  merely nodding or touching the brim.
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