this

The story

1. Proto-Indo-European*só
2. Proto-Germanic*sa, *þas
3. Proto-Germanic*þassi
4. Proto-West Germanic*þassi
5. Old Englishþes
6. Middle Englishþis
7. English todaythis

From Middle English þis, this, from Old English þis (neuter demonstrative), from the North Sea Germanic base *þa- (“that”), from Proto-Germanic *þat, from Proto-Indo-European *tód, extended form of demonstrative base *to-; + North-West Germanic definitive suffix *-s, from Proto-Indo-European *só (“this, that”). Cognate with Scots this (“this”), Saterland Frisian dusse (“this”), West Frisian dizze (“this”), German dies, dieses (“this”), Old Gutnish þissi (“this”).

Words from the same roots