a shock to the/someone's system

idiom

Definition of a shock to the/someone's system

: something that has a sudden and usually unpleasant effect on someone The cold weather was a shock to my system after being in the tropics. For freshmen, college life can be a real shock to the system.

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“A shock to the/someone's system.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/a%20shock%20to%20the%2Fsomeone%27s%20system. Accessed 12 Aug. 2020.

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