Where does “piilonappi” come from?

piilonappi (Finnish) comes from Finnish piilo, from Finnish piillä, from Proto-Finnic piildäk — to hide, to keep hidden.

piilonappi (Finnish): hidden button, concealed button

Definitions

  1. hidden button, concealed button

Ancestry of “piilonappi”, step by step

piilonappi traces back through two separate lines of ancestry.

via Finnish piilo

StepLanguageWordMeaning
1Finnishpiilohideout, lair, covert, hiding place; hidden
2Finnishpiilläto be hidden in, lie in; Adessive singular form...
3Proto-Finnicpiildäkto hide, to keep hidden

via Finnish näppi

StepLanguageWordMeaning
1Finnishnäppithe tips of the thumb and another finger or...
2Proto-Finnicnäppifingertip, finger
Every word from Proto-Finnic piildäkEvery word from Finnish piilläEvery word from Finnish piilo
piilonappi — Etymology, Origin & Word History | Etymology Explorer