What't"Out of set .Out of mind" mean?

What't"Out of set .Out of mind" mean? out of sight out of mind, out of sight,out of mind Out of sight,out of mind. Out of sight , out of mind 是什么意思? Don't let the cat out of the bag.What does it mean?______ hanging out of my friend--what is the mean? Get out of my mind Can't get u out of my mind...怎么翻译 out of side,out of mind 什么意思 out of site ,out of mind是怎么意思 out of your mind和out of your