From Wiktionary, the free dictionary
(This etymology is missing or incomplete. Please add to it, or discuss it at the Etymology scriptorium. Particularly: “reduplicative of rao?”)
rêu rao
- to tell others (often false) statements for nefarious and/or insidious purposes; to speak ill of; to disparage; to spread libel and/or slander; to malign; to traduce