The story
- Middle English · inherited fromhow-so
- English todayhow so
From ellipsis of "how is that so?", and also continuing Middle English how-so, hou-so, hu se (“however, in whatsoever way”). Compare West Frisian hoesa (“how so, why”), Dutch hoezo (“how so, why”), German Low German woso (“how so, why”), German wieso (“how so, why”), Swedish hurså (“how so”). By surface analysis, how + so.
Words from the same roots
Middle Englishhow-so all →
Etymology from Wiktionary, CC BY-SA 4.0.