Rue is defined as to regret or feel remorse.(verb)
An example of rue is a mother wishing she hadn't given her baby up for adoption.
See rue in Webster's New World College Dictionary
Origin: ME reowen < OE hreowan, akin to Ger reuen, to regret, ON hryggr, sorrowful, prob. < IE base *kreu-, to strike, beat > Gr krouein
Origin: OFr < L ruta < Gr rhytē
See rue in American Heritage Dictionary 4
verb rued rued, ru·ing, rues verb, transitive
Origin: Middle English ruen
Origin: , from Old English hrēowan, to affect with grief
Origin: , and hrēowian, to repent.
Origin: Middle English
Origin: , from Old French
Origin: , from Latin rūta
Origin: , probably from Greek rhūtē.
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