Become fixed or established (4,4)
I believe the answer is:
take root
(Other definitions for take root that I've seen before include "perform mathematical task" , "Settle down" , "Embed firmly" , "Send down shoots or become established" .)
I believe the answer is:
take root
(Other definitions for take root that I've seen before include "perform mathematical task" , "Settle down" , "Embed firmly" , "Send down shoots or become established" .)