be in each other's pockets
US /bi ɪn iːtʃ ˈʌðərz ˈpɑːkɪts/
UK /bi ɪn iːtʃ ˈʌðərz ˈpɑːkɪts/

1.
서로의 주머니 속에 있다, 너무 가깝다
to be very close and spend a lot of time together, often to the point of being too dependent or involved in each other's lives
:
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Those two sisters are always in each other's pockets; they do everything together.
그 두 자매는 항상 서로의 주머니 속에 있는 것 같아; 모든 것을 함께 해.
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It's good to be close, but they seem to be a bit too much in each other's pockets.
가까운 건 좋지만, 그들은 너무 서로의 주머니 속에 있는 것 같아.