rock hard
simple past tense and past participle of Prussify
(transitive) To fill to repletion, or restore something that has been depleted.
As tough, hard, or inflexible as a piece of rock. / (bodybuilding) With muscles developed and toned to a high degree, especially the muscles of the abdomen.
The wood of Cinnamomum camphora, an evergreen tree whose leaves have a smell of camphor when crushed.
凍結後、地面は岩のように硬くなり、庭を掘ることができなかった。
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