Meaning of “rock-solid” in the English Dictionary

british dictionary

"rock-solid" in British English

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rock-solidadjective

uk /ˌrɒkˈsɒlɪd/ us /ˌrɑːkˈsɑːlɪd/

(Definition of “rock-solid” from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)