also rock hard
Something that is ~ is very hard indeed.
During the dry season the land is rock hard.
ADJ
also rock hard
Something that is ~ is very hard indeed.
During the dry season the land is rock hard.
ADJ
Collins COBUILD. Толковый словарь английского языка для изучающих язык Коллинз COBUILD (международная база данных языков Бирмингемского университета) . 2012