Rise in waves (6)
I believe the answer is:
billow
(Other definitions for billow that I've seen before include "Wave; upward flow" , "Swell out (as a sail)" , "Swell out, as a flag" , "Become inflated; rise up, as in waves" , "Surge" .)
I believe the answer is:
billow
(Other definitions for billow that I've seen before include "Wave; upward flow" , "Swell out (as a sail)" , "Swell out, as a flag" , "Become inflated; rise up, as in waves" , "Surge" .)