seven lives; seven rebirths
Buddhist term referring to the seven successive lives or rebirths. Often used in the context of karmic retribution or the cycle of reincarnation. Can also be used adverbially to mean 'for seven lifetimes'.
I will not forget this grudge for seven lifetimes.
seven generations
Rare usage referring to seven generations of a family or lineage. This sense is less common and may appear in historical or literary contexts.
Records of the family lineage spanning seven generations remain.