NOD
—verb. (-dd-) 1 incline one`s head slightly and briefly in assent, greeting, or command. 2 let one`s head fall forward in drowsiness; be drowsy. 3 incline (one`s head). 4 signify (assent etc.) By a nod. 5 (of flowers, plumes, etc.) Bend downwards and sway. 6 make a mistake due to a momentary lack of alertness or attention. —none. Nodding of the head. ? nod off colloq. Fall asleep. [origin unknown]