Meaning of “be (as) thick as thieves” in the English Dictionary

English

"be (as) thick as thieves" in English

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be (as) thick as thieves

informal

to be very close friends and share secrets, etc.:

I'm sure she tells Ruth everything we say - they're as thick as thieves, those two.

(Definition of “be (as) thick as thieves” from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)

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