从眼皮底下溜走

从眼皮底下溜走

Literally means:

steal away under one's nose

Actually means:

眼皮底下 refers to the part immediately below the eyes; 溜走 means getting away without being noticed.

This phrase means that someone or something slips away in the presence of somebody. It is often used to indicate that something or someone should have been caught but was not.

眼皮底下，眼睛跟前或身边。溜走，悄悄走掉。

指看着某人或某物从自己跟前溜掉。常用来说明应当抓住却没有抓住。