Where does “thereinunder” come from?

thereinunder (English) comes from English therein, from English there, from Old English þær, from Proto-West Germanic þār, from Proto-Germanic þar, from Proto-Indo-European tar-, from Proto-Indo-European to-, from Proto-Indo-European só — this; that.

thereinunder (English): In and under that

Definitions

  1. In and under that

Ancestry of “thereinunder”, step by step

thereinunder traces back through two separate lines of ancestry.

via English therein

StepLanguageWordMeaning
1Englishthereinin that; in him/her/it
2EnglishthereIn a place or location at some distance from the...
3Old Englishþærthere
4Proto-West Germanicþārthere
5Proto-Germanicþarthere, in that place
6Proto-Indo-Europeantar-there
7Proto-Indo-Europeanto-it; that; the, that
8Proto-Indo-Europeanthis; that

via English under

StepLanguageWordMeaning
1EnglishunderIn or at a lower level than; As a subject of;...
2Middle Englishunderunder
3Old Englishunderunder, beneath
4Proto-Germanicunderamong, between; under, beneath; under
5Proto-Indo-Europeanh₁entérbetween
6Proto-Indo-Europeanh₁enin; in, inside
Every word from Proto-Indo-European Every word from Proto-Indo-European to-Every word from Proto-Indo-European tar-