暗扣 Traditional form: 暗扣 Pinyin (reading): ànkòu Definitions: hidden snap fastener (concealed behind a flap on a garment) Characters: 暗 - dark, gloomy; obscure; secret, covert 扣 - to detain; to knock, to tap; button Traditional characters: 暗 - dark, gloomy; obscure; secret, covert 扣 - to detain; to knock, to tap; button