Where does “testausajo” come from?

testausajo (Finnish) comes from Finnish testaus, from Finnish testata, from English Test, from German testen, from German Test, from English test, from Middle English teste, from Old French teste — to stand.

Ancestry of “testausajo”, step by step

testausajo traces back through two separate lines of ancestry.

via Finnish testaus

StepLanguageWordMeaning
1Finnishtestaustesting
2Finnishtestatato test
3EnglishTesta Test match
4Germantestento test
5GermanTesttest; melting pot
6EnglishtestA challenge, trial; A cupel or cupelling hearth...
7Middle Englishteste
8Old Frenchtestehead
9Latintestiswitness; one who testifies or attests; testicle
10Latinterstis
11Latintrīstissad, unhappy, melancholy, morose
12Proto-Indo-Europeantristh₂sa third party standing, after the two parties to...
13Proto-Indo-Europeansteh₂-to stand

via Finnish ajo

StepLanguageWordMeaning
1Finnishajodriving; riding; chase
2Finnishajaato drive, ride, travel in a vehicle, transport in...
3Proto-Finnicajadakto go in a vehicle, to drive
4Proto-Uralicaja-to drive; to hunt, chase
5Proto-Indo-IranianHáȷ́atito drive, lead
6Proto-Indo-Europeanh₂éǵetito be driving
7Proto-Indo-Europeanh₂eǵ-to drive
Every word from Proto-Indo-European steh₂-Every word from Proto-Indo-European tristh₂sEvery word from Latin trīstis