/bil"oh/ , n.
1. a great wave or surge of the sea.
2. any surging mass: billows of smoke.
v.i.
3. to rise or roll in or like billows; surge.
4. to swell out, puff up, etc., as by the action of wind: flags billowing in the breeze.
v.t.
5. to make rise, surge, swell, or the like: A sudden wind billowed the tent alarmingly.
[ 1545-55; bylgja wave, c. MLG bulge; akin to OE gebylgan to anger, provoke ]
Syn. 1. swell, breaker, crest, roller, whitecap.