Definition of billow
(Entry 1 of 2)
2
: a rolling mass (as of flame or smoke) that resembles a high wave
Billows of smoke poured out of the building. billows of fog
billow
verb
billowed; billowing; billows
Definition of billow (Entry 2 of 2)
1
: to rise or roll in waves or surges
the billowing sea
2
: to bulge or swell out (as through action of the wind)
billowing clouds … the flags … billowed out in pride …— G. B. Oxnam
: to cause to billow
a field of burning grass billowing thick black clouds of smoke into the sky— Donald Windham
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Merriam-Webster unabridged
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Time Traveler for billow
The first known use of billow was in 1552
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