"billow" in the noun sense
1. billow, surge
a large sea wave
"billow" in the verb sense
1. billow, wallow
rise up as if in waves
"smoke billowed up into the sky"
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
"The sails ballooned"
Source: WordNet® (An amazing lexical database of English)
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