nod - definition of nod by The Free Dictionary
nod (nŏd) v. nod·ded, nod·ding, nods v.intr. 1. To lower and raise the head quickly, as in agreement or acknowledgment. 2. To let the head fall forward when sleepy. 3. To be careless or momentarily inattentive as if sleepy; lapse: Even Homer nods. 4. To s...