1. (

• billow ,
• wallow ,

) rise up as if in waves; "smoke billowed up into the sky" ;

2. (

• billow ,

) move with great difficulty; "The soldiers billowed across the muddy riverbed" ;

3. (

• billow ,
• surge ,
• heave

) rise and move, as in waves or billows; "The army surged forward" ;

4. (

• balloon ,
• inflate ,
• billow

) become inflated; "The sails ballooned" ;