What is the meaning of billowing?

verb

• Rise up as if in waves.
  • usage: "smoke billowed up into the sky"
  • synonyms: billow, wallow
• Move with great difficulty.
  • usage: "The soldiers billowed across the muddy riverbed"
  • synonyms: billow
• Rise and move, as in waves or billows.
  • usage: "The army surged forward"
  • synonyms: billow, surge, heave
• Become inflated.
  • usage: "The sails ballooned"
  • synonyms: balloon, inflate, billow

adjective

• Characterized by great swelling waves or surges.
  • usage: "billowy storm clouds"; "the restless billowing sea"; "surging waves"
  • synonyms: billowy, surging