1. (v. i.) To bend or incline the upper part, with a quick motion; as, nodding plumes.

2. (v. i.) 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. (v. i.) To be drowsy or dull; to be careless.

4. (v. t.) 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.

5. (v. t.) To signify by a nod; as, to nod approbation.

6. (v. t.) To cause to bend.

7. (n.) A dropping or bending forward of the upper part or top of anything.

8. (n.) 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.

John Hancock OK Roman candle abide by accede accede to accept acceptance acclaim accord to accost acquiesce acquiesce in address adherence admiration affirmance affirmation affirmative affirmative attitude affirmativeness agree agree to agree with aid to navigation alarm amber light amen applaud approbation approval approve approve of assent authentication authorization aye bag balefire be caught napping be neglectful be negligent be willing beacon beacon fire beat the drum beck beck and call bell bell buoy bend bend the knee bend the neck bending the knee bid good day bid good morning bidding blessing blinker blue peter bob bob a curtsy bob down bow bow and scrape bow down bow the head bow to bowing and scraping broad hint buoy buy call calling calling forth cascade catalepsy caution light certification cheer clue coma comply condescend confirmation connive at consent consent to silently convocation countenance countersignature crouch cue curtsy daggle dangle default deign depend dip dipping the colors disregard dope off doze off drabble drag draggle drape droop drop asleep drop off drowse off duck embrace encephalitis lethargica endorse endorsement esteem evocation exchange colors fail fall fall asleep fall down before favor favorable vote flag flag down flap flare flash flop flow fog bell fog signal fog whistle foghorn gentle hint genuflect genuflection gesture give a signal give consent give the nod glance glimmer glimmering gloss over go along with go light go to sleep go-ahead gong buoy grant green light greet greeting hail hail and speak half-mast hand-clasp handshake hang hang down have no objection heliograph hello high high sign hint hoist a banner hold with homage how-do-you-do hug ignore implication imprimatur in toto inclination indent index indication inkling innuendo insinuation international alphabet flag international numeral pennant intimation invocation kick kiss kiss hands kneel kneeling kowtow lapse leer let go let ride let slide let slip lethargy lift the hat look lop lose sight of lose track of make a leg make a sign make obeisance making a leg marker beacon narcohypnosis narcolepsy narcoma narcosis narcotic stupor narcotization neglect nod nod assent nod of assent nod off nod to not care for not get involved not heed not refuse not think notarization nudge obeisance obsequiousness okay overlook parachute flare pass over pend permission permit pilot flag poke police whistle preconization presenting arms prompt prostration pull the forelock quarantine flag radio beacon raise a cry ratification ratify