It just slipped out.溜出来；被无意中说出，说漏嘴

I didn’t mean to say it, it just slipped out.我不是故意说的，不小心说漏嘴了。

He slipped quietly out of the room, and his parents didn’t evennotice.他悄悄从房间溜出来，他的父母都没有注意到。