be (as) thick as thieves
be (as) thick as thieves
To be very close friends. Anna and Beth are together all the time these days—they're as thick as thieves. The guys who work in the warehouse are thick as thieves. They don't really socialize with anyone else in the company. I've had a hard time making friends at my new school. The other kids have been together since kindergarten and are all thick as thieves.
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