Indulge

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early 17th century (in the sense ‘treat with excessive kindness’): from Latin indulgere ‘give free rein to’.

wiktionary

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From the Latin indulgeō(“I indulge”).

etymonline

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indulge (v.)

formerly also endulge, 1630s, "to grant as a favor;" 1650s, "to treat with unearned favor" (in reference both to persons and desires), a back-formation from indulgence (q.v.), or directly from Latin indulgere "be complaisant, be indulgent, yield; give oneself up to." Related: Indulged; indulging; indulgingly.