投诉 Traditional form: 投訴 Pinyin (reading): tóusù Definitions: to lodge a complaint Characters: 投 - to pitch, to throw; to bid, to invest 诉 - to accuse, to sue; to inform; to narrate Traditional characters: 投 - to pitch, to throw; to bid, to invest 訴 - to accuse, to sue; to inform; to narrate