NOD

I. verb (~ded; ~ding) Etymology: Middle English ~den; perhaps akin to Old High German hnotōn to shake Date: 14th century intransitive verb to make a quick downward motion of the head whether deliberately (as in expressing assent or salutation) or involuntarily (as from drowsiness), to incline or sway from the vertical as though ready to fall, to bend or sway the upper part gently downward or forward ; bob gently, to make a slip or error in a moment of abstraction, transitive verb to incline (as the head) downward or forward, to bring, invite, or send by a ~ , to signify by a ~ , ~der noun II. noun Date: circa 1541 the act or an instance of ~ding , an indication especially of approval or recognition