A nod of the head is a gesture in which the head is tilted in alternating up and down arcs along the sagittal plane. In many cultures, it is most commonly, but not universally, used to indicate agreement, acceptance, or acknowledgement.

What does nod mean in slang?

Definition: Fall asleep. Type: Slang Word (Jargon)

What does nodding at someone mean?

nod at (someone)

To lower one's head in someone's direction in a quick, subtle manner to communicate something to them, such as agreement, confirmation, respect, or salutation. There's a man in the neighborhood who nods at me every morning as I pass him, even though we've never actually spoken to one another.