(idiomatic) to take vengeance, to revenge

grudge / resentment / ill will

dispel / avenge oneself on someone / clear oneself of a feeling / accomplish a goal

ancient times, a very long time ago

an enemy / revenge, vengeance / opponent (of the game or conflict) / (archaic, obsolete) marriage partner

once (in the indeterminate past)

the past, old times / ancient

olden days; former

he / distal demonstrative, something far off removed from both speaker and listener: that / boyfriend

distal demonstrative, something far off removed from both speaker and listener: that, yon / particularly, male personal third person pronoun: he / by extension from he: boyfriend