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;