Assume control of (4,4)
I believe the answer is:
take over
'assume control of' is the definition.
(I've seen this before)
This is all the clue.
(Other definitions for take over that I've seen before include "Company buyout" , "Assume control of" , "Act of assuming control" , "Buying out of one company by another" , "This bid is for control of a business" .)