the.com/rite of passage

means A ritual or experience marking a significant transition from one stage of life or status to another, usually involving some test or ordeal.

from Translated from the French 'rite de passage,' coined by folklorist Arnold van Gennep in his early-20th-century study of ceremonies accompanying life transitions — birth, puberty, marriage, death. He broke these rituals into three phases: separation, transition (the liminal, in-between state), and incorporation back into society with a new status. The phrase was built from Latin 'ritus' (religious observance) and 'passus' (a step or passing), and it escaped academic anthropology to become everyday shorthand for any ordeal you emerge from changed.