The Clue
Swell, as a cloud (6 letter answer)
The Answer
BILLOW
Tags
Notes
The answer BILLOW is so rare that it appears less than once every 2500 puzzles.
Definition
BILLOW as a noun:
1. (billow, surge) = a large sea wave
BILLOW as a verb:
1. (billow, wallow) = rise up as if in waves; "smoke billowed up into the sky"
2. 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) = become inflated; "The sails ballooned"