Nod

1. To be drowsy or dull; to be careless.
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 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.
4. To cause to bend.
5. To bend or incline the upper part, with a quick motion; as, nodding plumes.
6. 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.
7. To signify by a nod; as, to nod approbation.
8. A dropping or bending forward of the upper oart or top of anything.