Where does “underside” come from?

underside (Norwegian Bokmål) comes from Norwegian Bokmål side, from Old Norse síða, from Proto-Germanic sīdǭ, from Proto-Germanic sīdaz, from Proto-Indo-European sēy-, from Proto-Indo-European ḱe- — demonstrative particle; here; this, here.

underside (Norwegian Bokmål): underside

Definitions

  1. underside

Ancestry of “underside”, step by step

underside traces back through two separate lines of ancestry.

via Norwegian Bokmål side

StepLanguageWordMeaning
1Norwegian Bokmålsidea page; side; aspect
2Old Norsesíðaside
3Proto-Germanicsīdǭside
4Proto-Germanicsīdazdrooping, hanging down, pendulous, long,...
5Proto-Indo-Europeansēy-to send, throw, drop, sow, deposit; to linger
6Proto-Indo-Europeanḱe-demonstrative particle; here; this, here

via Norwegian Bokmål under

StepLanguageWordMeaning
1Norwegian Bokmålunderbelow; beneath; during; under
2Old Norseundirunder, underneath
3Proto-Germanicunderamong, between; under, beneath; under
4Proto-Indo-Europeanh₁entérbetween
5Proto-Indo-Europeanh₁enin; in, inside
Every word from Proto-Indo-European ḱe- →Every word from Proto-Indo-European sēy- →Every word from Proto-Germanic sīdaz →