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  1. shin-cracker

    • n.
      (in opal mining) very hard, brittle rock that splinters easily
    • noun: shin-cracker

    • 釋義

    名詞

    • 1. Australian informal (in opal mining) very hard, brittle rock that splinters easily in a hole of that depth you would first sink through about 10 or 12 feet of shin-cracker