badmouth

Calque of a Mande term, perhaps Vai [Term?] or Mandinka [Term?], which entered English via Gullah [Term?]. Compare Japanese 悪口(わるぐち) (waruguchi, “badmouthing”), which is a compound of 悪(わる) (waru, “bad, wicked”) and 口(くち) (kuchi, “mouth”).