Gradually become larger (4)
I believe the answer is:
grow
(Other definitions for grow that I've seen before include "Become bigger" , "Swell" , "Mature" , "Wax" , "Develop - propagate" .)
I believe the answer is:
grow
(Other definitions for grow that I've seen before include "Become bigger" , "Swell" , "Mature" , "Wax" , "Develop - propagate" .)