Where does “ristiinkytkentä” come from?

ristiinkytkentä (Finnish) comes from Finnish kytkentä, from Finnish kytkeä, from Proto-Finnic kütkedäk, from Proto-Uralic kütke- — to bind.

Ancestry of “ristiinkytkentä”, step by step

ristiinkytkentä traces back through two separate lines of ancestry.

via Finnish kytkentä

StepLanguageWordMeaning
1Finnishkytkentäcoupling
2Finnishkytkeäto hook, hook up, connect, couple; "~ irti" = to...
3Proto-Finnickütkedäkto bind, to tie
4Proto-Uralickütke-to bind

via Finnish ristiin

StepLanguageWordMeaning
1Finnishristiinacross; criss, in the expression ristiin rastiin;...
Every word from Proto-Uralic kütke-Every word from Proto-Finnic kütkedäkEvery word from Finnish kytkeä