Where does “under erasure” come from?

under erasure (English) comes from French sous, from Middle French soubs, from Old French soz, from Latin subtus, from Latin sub, from Proto-Italic supo, from Proto-Indo-European upó, from Proto-Indo-European h₃ewp-.

Ancestry of “under erasure”, step by step

StepLanguageWordMeaning
1Frenchsousbelow, under; plural of sou; money
2Middle Frenchsoubsunder; underneath
3Old Frenchsozunder
4Latinsubtusbelow, underneath, beneath
5Latinsubunder, beneath; behind; at the feet of
6Proto-Italicsupounder
7Proto-Indo-Europeanupóunder, below
8Proto-Indo-Europeanh₃ewp-—
Every word from Proto-Indo-European h₃ewp- →Every word from Proto-Indo-European upó →Every word from Proto-Italic supo →