Nail under false color

• 冒充；打着别人的招牌骗人

Nail under false color的用法和样例：

例句

1. He senses that the woman knows he is sailing under false colors.
   他感觉这个女人知道他是冒充的。
2. They found out that Smith was an escaped convict who had been sailing under false colours as a lawyer.
   他们发现史密斯原来是一个冒充律师的逃犯。