The story
- Old English · inherited fromþǣrūt
- Middle English · inherited fromther-oute
- English todaythereout
From Middle English ther-oute, þer-out, þar-out, þeroute, from Old English þǣrūt and þǣrūte, equivalent to there + out. Compare Saterland Frisian deeruut, Dutch daaruit, German Low German daarut, German daraus.
Etymology from Wiktionary, CC BY-SA 4.0.