狗嘴吐不出象牙

詞語解釋

狗嘴吐不出象牙[ gǒu zuǐ tǔ bu chū xiàng yá ]

⒈  比喻壞人口里說不出好話。也作“狗嘴長不出象牙”

英look not for musk in dog's kennel; a dog's mouth emits no ivory;