1. (v. t.) To touch gently, as with the elbow, in order to call attention or convey intimation.

2. (n.) A gentle push, or jog, as with the elbow.

Roman candle actuate aid to navigation alarm amber light assault attouchement balefire beacon beacon fire bear bear upon bearing beat the drum bell bell buoy blinker blue peter boost bring to recollection broad hint brush brush by buck bull bulldoze bump bump against bunt buoy butt butt against caress carry back caution light clue come in contact contact contingence cram crowd cue dig dip drive elbow encourage encouragement exchange colors flag flag down flare flash flog fog bell fog signal fog whistle foghorn force gentle hint gesture give a hint give a signal give the cue give the nod glance glimmer glimmering go light goad gong buoy graze green light hail hail and speak half-mast head heliograph high sign hint hit hoist a banner hold the promptbook hurtle hustle impel impinge impingement impingence implication index indication inkling innuendo insinuation international alphabet flag international numeral pennant intimation jab jam jog jog the memory joggle jolt jostle kick kiss lash leer look make a sign marker beacon mobilize motivate move nag needle nod osculate osculation parachute flare pile drive pilot flag poke police whistle press pressure prick prod prompt prompt the mind propel punch push put in mind put in remembrance quarantine flag radio beacon raise a cry ram ram down rattle recall red flag red light remember remind remind one of rocket rub run run against sailing aid salute scent scrape semaphore semaphore flag semaphore telegraph set in motion shake shave shoulder shove sideswipe sign signal signal beacon signal bell signal fire signal flag signal gong signal gun signal lamp signal light signal mast signal post signal rocket signal shot signal siren signal tower signalize skim skirt sound an alarm sound the trumpet spar buoy speak spoor spur squeak by sting stop light stress suggest suggestion suspicion symptom taction tamp tangency telltale tentative contact the nod the wink thrust touch touching track traffic light traffic signal unfurl a flag watch fire wave wave a flag wave the hand whip whisper white flag wigwag wigwag flag wink yellow flag