- a large sea wave
- rise up as if in waves; "smoke billowed up into the sky"
- move with great difficulty; "The soldiers billowed across the muddy riverbed"
- rise and move, as in waves or billows; "The army surged forward"
- balloon: become inflated; "The sails ballooned"
- In mathematics and science, a wave is a disturbance that travels through space and time, usually by the transfer of energy. Waves are described by a wave equation that can take on many forms depending on the type of wave. ...
- A large wave, swell, surge, or undulating mass of water, smoke or sound; To surge or roll in billows; To swell out or bulge