in a world of hurt
Subject to a large or intense amount of pain, misfortune, poor treatment, etc. If you don't keep your financial accounts in order, you'll be in a world of hurt when it's time to file your taxes. Now, be sure not to swap around the dosages of these two medications, or you'll be in a world of hurt! My boyfriend knows, rightly, that he'd be in a world of hurt if he ever lied to me like that.
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