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billow (n.)

"a great wave or surge of the sea," 1550s, perhaps older in dialectal use (but not recorded in Middle English), from Old Norse bylgja "a wave, a billow," from Proto-Germanic *bulgjan (source also of Swedish bölja, Danish bölge "a billow," Middle High German bulge "a billow; a bag"), from PIE *bhelgh- "to swell," extended form of root *bhel- (2) "to blow, swell."

billow (v.)

"to rise or roll in large waves," 1590s, from billow (n.). Related: Billowed; billowing.

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Definitions of billow
1
billow (v.)
rise up as if in waves;
smoke billowed up into the sky
Synonyms: wallow
billow (v.)
move with great difficulty;
The soldiers billowed across the muddy riverbed
billow (v.)
rise and move, as in waves or billows;
Synonyms: surge / heave
billow (v.)
become inflated;
Synonyms: balloon / inflate
2
billow (n.)
a large sea wave;
Synonyms: surge
From wordnet.princeton.edu