poetic justice
noun/pəʊˌetɪk ˈdʒʌstɪs/
/pəʊˌetɪk ˈdʒʌstɪs/
[uncountable]- a situation in which something bad happens to somebody, and you think that this is what they deserve
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poetic justice
Definition of poetic justice noun from the Oxford Advanced Learner's Dictionary