Where does “rotsvast” come from?

rotsvast (Dutch) comes from Dutch vast, from Middle Dutch vast, from Old Dutch fast, from Proto-West Germanic fast, from Proto-Germanic fastuz — fixed, firm, secure.

rotsvast (Dutch): rock-solid; firmly

Definitions

  1. rock-solid; firmly

Ancestry of “rotsvast”, step by step

rotsvast traces back through two separate lines of ancestry.

via Dutch vast

StepLanguageWordMeaning
1Dutchvastfirm, fast, tight; fixed, not moving or changing;...
2Middle Dutchvast
3Old Dutchfastfirm, strong
4Proto-West Germanicfastfixed, fast
5Proto-Germanicfastuzfixed, firm, secure

via Dutch rots

StepLanguageWordMeaning
1Dutchrotsa rock
Every word from Proto-Germanic fastuzEvery word from Proto-West Germanic fastEvery word from Old Dutch fast