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

1.
estar en los bolsillos el uno del otro, ser inseparables
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
:
•
Those two sisters are always in each other's pockets; they do everything together.
Esas dos hermanas siempre están en los bolsillos la una de la otra; hacen todo juntas.
•
It's good to be close, but they seem to be a bit too much in each other's pockets.
Es bueno ser cercanos, pero parecen estar demasiado en los bolsillos el uno del otro.