狗嘴吐不出象牙

词语解释

狗嘴吐不出象牙[ gǒu zuǐ tǔ bu chū xiàng yá ]

⒈  比喻坏人口里说不出好话。也作“狗嘴长不出象牙”

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