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that'll teach sb

Definition

If someone says that they or an unpleasant experience will teach someone (not) to do something, they mean that they will stop that person from doing it in future by making them experience the bad effects of their action: So Roger spent the night in a freezing garage, did he? That'll teach him to (= show him that he should not) go out without his house keys!Teaching in general
(Definition of that'll teach sb from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)