thus

The story

1. Proto-West Germanic · inherited from*þus“so, thus”
2. Old English · inherited fromþus“thus, in this way, as follows, in this manner, to this extent”
3. Middle English · inherited fromthus
4. English todaythus

From Middle English thus, þus, from Old English þus (“thus, in this way, as follows, in this manner, to this extent”), from Proto-West Germanic *þus (“so, thus”), perhaps originally from a variant of the instrumental form of this, related to Old English þȳs (“by this, with this”), Old Saxon thius (“by this, with this”). Cognate with Scots thus (“thus”), North Frisian thus, Saterland Frisian dus, düs (“thus”), West Frisian dus (“thus”), Dutch dus (“thus, so”), Middle High German dus (“thus, as follows”). Compare also Dutch zus (“thus, hence”), Low German sus (“thus, hence”), Middle High German sus (“thus, hence”), a similar formation from the stem of Proto-West Germanic *swā (“so”).