Webster's Revised Unabridged Dictionary · 1913

Nod

Nod (nod) , intransitive verb

[Old English nodden; compare Old High German knōtōn, genuotōn, to shake, and English nudge.]

1.
To bend or incline the upper part, with a quick motion; as, nodding plumes.
2.
To incline the head with a quick motion; to make a slight bow; to make a motion of assent, of salutation, or of drowsiness, with the head; as, to nod at one.
3.
To be careless or inattentive; to make a mistake from lack of attention.
Nor is it Homer nods, but we that dream. — Pope
4.
To be drowsy or dull; to doze off, especially while in a sitting position; as, half the class nodded while the professor droned on.

Nod , transitive verb

1.
To incline or bend, as the head or top; to make a motion of assent, of salutation, or of drowsiness with; as, to nod the head.
2.
To signify by a nod; as, to nod approbation.
3.
To cause to bend. [Poetic]
By every wind that nods the mountain pine. — Keats

Nod (nod) , noun

1.
A dropping or bending forward of the upper part or top of anything.
Like a drunken sailor on a mast, Ready with every nod to tumble down. — Shakespeare
2.
A quick or slight downward or forward motion of the head, in assent, in familiar salutation, in drowsiness, or in giving a signal, or a command; as, a nod of approval.
A look or a nod only ought to correct them [the children] when they do amiss. — Locke
Nations obey my word and wait my nod. — Prior
Collocations (1)
The land of Nod , sleep.