Definitions for "Billow"
Keywords:  surge, nto, wave, undulate, rise
A great wave or surge of the sea or other water, caused usually by violent wind.
A great wave or flood of anything.
To surge; to rise and roll in waves or surges; to undulate.
move with great difficulty; "The soldiers billowed across the muddy riverbed"
Keywords:  sails, ballooned, inflated
become inflated; "The sails ballooned"