Present participle of forleave; the act of abandoning, leaving behind, or ceasing to do something.
Regular English gerund/present participle formation from the verb 'forleave.' The '-ing' suffix transforms the verb into a noun or continuous form.
Medieval texts use 'forleaving' when describing monks giving up worldly possessions or knights abandoning their quests—it captures a sense of finality that plain 'leaving' doesn't have.
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