out of one's system
Out of one's thoughts or inclinations. It is often put as get something out of one's system, as in You need to get your ex-husband out of your system, or At the annual all-chocolate buffet I try everything, which gets it out of my system for at least a month, or Let him complain as much as he wants so he'll get it out of his system. This idiom uses system in the sense of “all one's physical and mental functions.” [c. 1900]
Words nearby out of one's system
out of one's depth,
out of one's element,
out of one's hair,
out of one's mind,
out of one's shell,
out of one's system,
out of one's way,
out of order,
out of phase,
out of place,
out of pocket