rock solid

adjective
🔊/ˌrɒk ˈsɒlɪd/
🔊/ˌrɑːk ˈsɑːlɪd/
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  1. that you can trust not to change or to disappear稳固的;坚实的;可信赖的
    • The support for the party was rock solid.这一政党得到了坚定的支持。🔊🔊
  2. extremely hard and not likely to break坚硬的;不会碎的
    • The ice on the river was rock solid.河上的冰块坚如磐石。