be/live in each other's pockets

live in each other's pockets

Said of people who spend a lot of time together. When I was in college, my best friend and I went everywhere together. We basically lived in each other's pockets for four years.
See also: each, live, pocket
Farlex Dictionary of Idioms.

live in each other's pockets

mainly BRITISH
If two or more people live in each other's pockets, they spend a great deal of time together. Just because you're married doesn't mean you have to live in each other's pockets. Note: Other verbs are sometimes used instead of live. It's hard to explain how the two of them survived 23 years in each other's pockets. Note: This expression is used to show disapproval.
See also: each, live, pocket
Collins COBUILD Idioms Dictionary, 3rd ed.

be/live in each other’s ˈpockets

(British English) if two people are in each other’s pockets, they are too close to each other or spend too much time with each other: They live together, work together and socialize together. If you ask me, it can’t be healthy to live in each other’s pockets like that.
See also: each, live, pocket
Farlex Partner Idioms Dictionary
See also:
  • live in each other's pockets
  • we should get together (sometime)
  • Let's get together
  • let's get together (sometime)
  • bring (someone or something) together
  • bring together
  • huddle together
  • hang together
  • posse
  • draw together