Fixate (on) (6)
I believe the answer is:
obsess
(Other definitions for obsess that I've seen before include "Think only" , "Haunt - preoccupy" , "Be constantly preoccupied" , "brood" , "Persistently preoccupy" .)
I believe the answer is:
obsess
(Other definitions for obsess that I've seen before include "Think only" , "Haunt - preoccupy" , "Be constantly preoccupied" , "brood" , "Persistently preoccupy" .)