口蜜腹剑的英文：
[Literal Meaning]
mouth/honey/belly/dagger
honey in one's mouth but dagger in one's heart

[解释]
形容两面派的狡猾、阴险。

[Explanation]
hypocritical and malignant

[例子]
他这人口蜜腹剑，非常阴险，你要小心。

[Example]
He is a hypocritical and malignant guy and very mean. You should be careful.

[英文等价词]
a wolf in sheep's clothing

A wolf in sheep's clothing
披着羊皮的狼,口蜜腹剑的人。

a wolf in sheep's clothing=a wolf in lamb's skin)
披着羊皮的豺狼;伪装友善的敌人,口蜜腹剑的人

Peace of the forehead and war in the mind
口蜜腹剑

Many one says well that thinks ill
口蜜腹剑者不乏其人