The story
- Proto-Indo-European · derived from*só
- Proto-Germanic · derived from*sa“that”
- Proto-West Germanic · derived from*þes-
- Old English · inherited fromþas
- Middle English · inherited fromþes
- English todaythese
From Middle English þes, from Old English þas, from Proto-West Germanic *þes-, a form of Proto-Germanic *sa (“that”), from Proto-Indo-European *só. Compare with German diese.
Words from the same roots
Proto-Germanic*sa all →
the
Proto-Indo-European*só all →
thesoonthereabout
Etymology from Wiktionary, CC BY-SA 4.0.