Definition: a large sea wave
Main entry: inflate, billow, balloon
Definition: become inflated
Usage: The sails ballooned
Main entry: billow, surge, heave
Definition: rise and move, as in waves or billows
Usage: The army surged forward
Definition: rise up as if in waves
Usage: smoke billowed up into the sky
Main entry: billow
Definition: move with great difficulty
Usage: The soldiers billowed across the muddy riverbed