Denouement
Etymology
From French "dénouement," "an untying," from dénouer, "to untie," from Latin dis-, "apart," and nodare, "to knot," from nodus, "knot." The metaphor treats a plot as a tangle of knotted threads that the ending loosens. English took the word, and the image, straight from French dramatic criticism.
noun · /day-noo-MAWN/
The final part of a story where the strands of the plot are unraveled and resolved.
What it names
The settling after the climax, when secrets are explained and loose ends tie off, giving you a precise name for the wind-down that is neither the crisis nor a mere afterthought.
Example
The murder is solved with twenty pages to spare, and the long denouement gently returns each surviving character to ordinary life.
Related idea
The climax is the peak of tension; the denouement is the unwinding that follows it and brings the story to rest.