Buoy

Noun

 * 1)  A float moored in water to mark a location, warn of danger, or indicate a navigational channel.
 * 2) A lifebuoy.

Verb

 * 1)  To keep afloat or aloft.
 * 2)  To support or maintain at a high level.
 * 3)  To mark with a buoy.

Adjectives for Buoy
dancing; heaving; ringing; rocking; warning.

Derived terms

 * buoy up
 * can buoy
 * conical buoy
 * bell buoy
 * ring buoy
 * life buoy
 * breeches buoy

Thesaurus
uplift, upraise, waft, watch fire, water wings, white flag, wigwag, wigwag flag, wink, yellow flag, aid to navigation, alarm, amber light, balefire, balsa, balsa raft, beacon, beacon fire, bear up, bell, bell buoy, blinker, blue peter, bob, boom, breeches buoy, buoy up, caution light, cork, cork jacket, ejection capsule, ejection seat, ejector seat, elevate, flare, float, float high, fog bell, fog signal, fog whistle, foghorn, glance, go light, gong buoy, green light, hearten, heliograph, high sign, hold up, international alphabet flag, international numeral pennant, keep up, kick, leer, life belt, life buoy, life jacket, life net, life preserver, life raft, life ring, life vest, lifeboat, lifeline, lift, lollipop, marker beacon, nod, nudge, parachute, parachute flare, pilot flag, poke, police whistle, pontoon, quarantine flag, radio beacon, raft, raise, red flag, red light, ride high, rocket, rubber dinghy, safety belt, sailing aid, semaphore, semaphore flag, semaphore telegraph, 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, siren, spar buoy, stop light, support, surfboard, sustain, the nod, the wink, touch, traffic light, traffic signal, upbear, uphold,

Etymology
From buoy: 'a float', from  boeye: 'a float, signal; line, tether' (cf.  boei: 'buoy'), from 🇫🇴 boie:, buie: 'line, fetter, chain', from  boiae: 'fetters', originally, 'leather collar for the neck', from Ancient Greek undefined: 'strap of ox-leather', from undefined: 'ox'. More at cow.