- [noun] a large sea wave
- [verb] rise up as if in waves; "smoke billowed up nto the sky"
- [verb] move with great difficulty; "The soldiers billowed across the muddy riverbed"
- [verb] rise and move, as in waves or billows; "The army surged forward"
Synonyms: surge, heave
- [verb] become inflated; "The sails ballooned"
Synonyms: balloon, inflate
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