Etymology tree Proto-Indo-European *h₁én Proto-Italic *en Proto-Italic *en- Latin in- Proto-Indo-European *ḱel- Proto-Indo-European *-éyti Proto-Indo-European *ḱley-der. Proto-Italic *kleināō Latin clīnō Latin inclīnāre Old French enclinerbor. Middle English enclinen English incline English -ed English inclined From incline + -ed.