English version

ex post facto law

From Longman Dictionary of Contemporary English
Related topics: Law
ex post facto lawex post fac‧to law /ˌeks pəʊst ˈfæktəʊ ˌlɔː $ -poʊst ˈfæktoʊ ˌlɒː/ noun [countable] law  SCLa law that makes a particular action into a crime, and then punishes people who took that action before it had legally become a crime
Examples from the Corpus
ex post facto lawNo bill of attainder, or ex post facto law shall be passed.
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