Refund
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From Middle English refunden, refounden, from Old French refondre, refonder, refunder (“to restore; pay back”), from Latin refundere; prefix re- (“re-”) + fundere (“to pour”): compare French refondre, refonder. See fuse (“to melt”), and compare refound (“to cast again”), and refuse.
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The root dāl fā ʿayn (د ف ع)