Where does “kastekäsky” come from?

kastekäsky (Finnish) comes from Finnish kaste, from Proto-Finnic kastek, from Proto-Finnic kastadak, from Proto-Finnic -tadak, from Proto-Uralic -ta- — Forms verbs from nouns; Forms causative verbs...

Ancestry of “kastekäsky”, step by step

kastekäsky traces back through two separate lines of ancestry.

via Finnish kaste

StepLanguageWordMeaning
1Finnishkastedew; baptism, christening
2Proto-Finnickastekdew
3Proto-Finnickastadakto wet, to soak; to dip, to immerse
4Proto-Finnic-tadakForms verbs from both nominal and verbal stems
5Proto-Uralic-ta-Forms verbs from nouns; Forms causative verbs...

via Finnish käsky

StepLanguageWordMeaning
1FinnishkäskyAn order, command, commandment, dictation,...
2Finnishkäskeäto order, tell; to command; to request, ask for,...
3Proto-Finnickäskedäkto tell, to command
4Proto-Uralickäske-—
Every word from Proto-Uralic -ta- →Every word from Proto-Finnic -tadak →Every word from Proto-Finnic kastadak →