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

     

    rock solid

     adjective
    adjective
    BrE
     
    ; NAmE
     
     
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  1. 1that you can trust not to change or to disappear The support for the party was rock solid.
  2. 2extremely hard and not likely to break The ice on the river was rock solid.
See the Oxford Advanced American Dictionary entry: rock solid