Where does “nithar” come from?

nithar (Old Dutch) comes from Proto-Germanic niþer, from Proto-Indo-European niter.

Ancestry of “nithar”, step by step

StepLanguageWordMeaning
1Proto-Germanicniþerdown, downwards
2Proto-Indo-Europeanniter—
Every word from Proto-Indo-European niter →Every word from Proto-Germanic niþer →