In stages (4,2,4)
I believe the answer is:
step by step
(Other definitions for step by step that I've seen before include "advance via stair" , "Gradually" , "A bit at a time" , "climb ladder thus" , "Incrementally" .)
I believe the answer is:
step by step
(Other definitions for step by step that I've seen before include "advance via stair" , "Gradually" , "A bit at a time" , "climb ladder thus" , "Incrementally" .)