
Be/live in each other’s pockets
Close Association
Implies a very close and possibly overly dependent relationship between people.
The twins are always together; they really live in each other's pockets.
Potential Negativity
May suggest lack of independence or clinginess in a relationship.
It's not healthy that they live in each other's pockets; they need some time apart.
Colloquial Usage
Used informally, more often in casual conversation than in formal writing.
They're roommates and best friends, so they're always in each other's pockets.
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