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3. out of one's system

out of one's system

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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]

See also: of, out, system