(v. t.) To signal by means of a flag waved from side to side according to a code adopted for the purpose.

Lissajous figure Roman candle aid to navigation alarm alternate alternation amber light back and fill back-and-forth balefire battledore and shuttlecock beacon beacon fire bell bell buoy blinker blue peter brandish buoy caution light come and go coming and going ebb and flow flap flare flaunt float flourish flutter flux and reflux fly fog bell fog signal fog whistle foghorn glance go light gong buoy green light heliograph high sign hitch and hike international alphabet flag international numeral pennant kick leer marker beacon nod nudge parachute flare pass and repass pilot flag poke police whistle quarantine flag radio beacon reciprocate reciprocation red flag red light rhythmic play ride and tie rocket sailing aid seesaw seesawing semaphore semaphore flag semaphore telegraph shake shuttle shuttlecock 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 sine wave spar buoy stop light swing teeter teeter-totter teeter-tottering teetering the nod the wink to-and-fro tottering touch traffic light traffic signal undulate ups and downs wag watch fire wave wax and wane white flag wibble-wabble wield wigwag flag wink yellow flag zigzag