live in (one's) pocket

live in (one's) pocket

To spend an excessive amount of time with or in close proximity to one. When I was in college, my best friend and I basically lived in each other's pockets for four years. I adored my brother growing up, and I lived in his pocket until he left high school.
See also: live, pocket

live in someone's pocket

live very close to someone and be closely involved with them.
See also: live, pocket