/rɪˌfɔːrˈmeɪʃən ɪn ˈpeɪjəs/ – Phrase
Definition: sự chuyển biến theo chiều hướng tồi tệ hơn.
A more thorough explanation: Reformatio in pejus is a Latin term used in legal contexts to refer to a situation where an appellate court modifies a lower court’s decision in a way that is unfavorable to the appealing party. In other words, it means a change for the worse.
Example: In a criminal trial, the principle of reformatio in pejus prohibits a court from increasing the defendant’s sentence on appeal if the defendant did not appeal the sentence themselves.