þȳ (Old English) comes from Old English þæt, from Proto-Germanic þat, from Proto-Indo-European tód, from Proto-Indo-European to-, from Proto-Indo-European só — this; that.
þȳ (Old English): by that; therefore; because; since; by that,...
Definitions
by that; therefore; because; since; by that,...
Ancestry of “þȳ”, step by step
þȳ traces back through two separate lines of ancestry.