"billowing" in the verb sense
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"
"billowing" in the adjective sense
1. billowy, billowing, surging
characterized by great swelling waves or surges
"billowy storm clouds"
"the restless billowing sea"
"surging waves"
Source: WordNet® (An amazing lexical database of English)
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