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English definition of “be (as) solid as a rock”

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be (as) solid as a rock

to be very strong: You'd think her own marriage was solid as a rock.
Translations of “be (as) solid as a rock”
in Chinese (Traditional) 堅如磐石,非常牢固…
in Chinese (Simplified) 坚如盘石,非常牢固…
(Definition of be (as) solid as a rock from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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