be (as) thick as thieves

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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.
See also: thick, thief
References in periodicals archive ?
Jimmy (Dean Sullivan) is alarmed when he has an encounter with Emily (Jennifer Ellison) this week, oo-er, and Tim the crim (Phillip Olivier) and Christy the cup (see ears) are thick as thieves.
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