joined at the hip

• joined-at-the-hip

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joined at the hip

1. (idiomatic, informal) Closely connected, as in an intimate friendship.
   • 1987 June, “The Jeffrey Show”, in Texas Monthly, volume 15, number 6, page 159:

     We're very close. In fact, we're joined at the hip.

   • 2021 May 19, Christian Wolmar, “Resolving the Eurostar problem will benefit Britain...”, in RAIL, number 931, page 46:

     When people suggest to me that it would be best if politics were left out of the railways, I always point out that the two are joined at the hip. Throughout the near 200-year existence of the railways, there has never been a time when they have been free of political interference.

• live in each other's pockets