From Longman Dictionary of Contemporary Englishthe best/biggest etc ... of all timethe best/biggest etc ... of all timethe best, biggest etc of a particular kind of person or thing that has ever existed He is the greatest athlete of all time, in my opinion. → time
Examples from the Corpus
the best/biggest etc ... of all time• And seeing as it was my brainchild, would you not say it was possibly the best commercial of all time?• You could call that round the biggest fluke of all time...• That's the biggest understatement of all time!• Surely the biggest robbery of all time was the $ 900m that the Dome stole from lottery funds? 