Where does “slå fast” come from?

slå fast (Swedish) comes from Swedish slå, from Old Swedish slā, from Old Norse slá, from Proto-Germanic slahaną, from Proto-Indo-European slak- — to hit; strike; to hit, strike, throw; to hit,...

slå fast (Swedish): to (claim to) firmly establish, to ascertain, to determine

Definitions

  1. to (claim to) firmly establish, to ascertain, to determine

Ancestry of “slå fast”, step by step

slå fast traces back through two separate lines of ancestry.

via Swedish slå

StepLanguageWordMeaning
1Swedishslåto hit, punch or beat (someone); to give a blow
2Old Swedishslāto hit, to strike
3Old Norsesláto hit, beat, strike; to strike, pluck
4Proto-Germanicslahanąto hit, to strike; to kill
5Proto-Indo-Europeanslak-to hit; strike; to hit, strike, throw; to hit,...

via Swedish fäst

StepLanguageWordMeaning
1Swedishfästfast
2Old Swedishfasterfast, firm
3Old Norsefastrfast, firm, sticking fast to the spot; close,...
4Proto-Germanicfastuzfixed, firm, secure
Every word from Proto-Indo-European slak-Every word from Proto-Germanic slahanąEvery word from Old Norse slá