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English definition of “be (as) thick as thieves”

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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.
Translations of “be (as) thick as thieves”
in Chinese (Traditional) 親密無間,非常友好…
in Chinese (Simplified) 亲密无间,非常友好…
(Definition of be (as) thick as thieves from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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