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 ?
North Wales Police sent a direct message to the raiders who it could be said are as thick as thieves.
Me and his dad are as thick as thieves" - Singer Cheryl Cole.