Nod - (Webster's 1828 Dictionary)
NOD, v.i. [Gr. contracted; a nod; to nod, to beckon, a leap a spring; to leap, to throb or beat, as the pulse]
1. To incline the head with a quick motion, either forward or sidewise, as persons nod in sleep.
2. To bend or incline with a quick motion; as nodding plumes.
The nodding verdure of its brow.
3. To be drowsy.
Your predecessors, contrary to other authors, never pleased their readers more than when they were nodding.
4. To make a slight bow; also, to beckon with a nod.
NOD, v.t. To incline or bend; to shake.
1. A quick declination of the head.
A look or a nod only ought to correct them when they do amiss.
2. A quick declination or inclination.
Like a drunken sailor on a mast, ready with every nod to tumble down.
3. A quick inclination of the head in drowsiness or sleep.
4. A slight obeisance.
5. A command; as in L. numen, for nutamen.