Definition of the Rock of Gibraltar from the Oxford Advanced Learner's Dictionary

 

the Rock of Gibraltar

 
BrE
 
; NAmE
 
 
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a high cliff at the south-western edge of the Mediterranean Sea, near the town and port of Gibraltar. When people say that something is as solid as the Rock of Gibraltar, they mean it is very safe or firm I was told the investment was as safe as the Rock of Gibraltar.