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Lit., "while there was no time for escaping".
It is to be noted that the term qarn signifies not merely a "generation" but also - and quite frequently in the Qur'an - "people belonging to a particular period and environment", i.e., a "civilization" in the historical connotation of this word.
Teaching, Warning, Signs have been given by Allah to all nations and at all times, and yet nations have rebelled and gone wrong and suffered destruction. If only later generations could learn that wrong-doing results in self-destruction! For the justice of Allah merely carries out the result of their own choice and actions. At any time during their probation they could repent and obtain mercy, but their "Self-glory and Separatism" stand in the way. Ultimately they do cry for a way of escape, but it is then too late.