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
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.
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References in periodicals archive ?
A source said: "Courteney and Jennifer are thick as thieves and they have got even closer in recent months.
AISLE BE THERE FOR YOU; Friends Jen is maid of honour at Courteney's wedding; EXCLUSIVE
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. Apt really, as that's what they are.
SOAP of the week; BROOKSIDE Ch4, Wednesday, 8.00pm, 8.30pm; Friday, 8.30pm
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