1. To have a particular consequence, usually something good or positive: Shirley made a decision that redounded to a better future for her.
2. To return to affect someone as a repercussion or a consequence; to have a good, or bad, effect or result.
3. Etymology: "to overflow," from Old French redonder, "overflow, abound" (12th century); from Latin redundare, "to overflow".

The meaning of "to flow" or "to go back" (to a place or person) is from 1382.