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Definition of rock-hard adjective from the Oxford Advanced Learner's Dictionary

rock-hard

adjective

/ˌrɒk ˈhɑːd/

/ˌrɑːk ˈhɑːrd/

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extremely hard or strong
- The ground is still rock-hard.
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See rock-hard in the Oxford Advanced American Dictionary

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Idioms

(caught/stuck) between a rock and a hard place

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