Where does “стаичка” come from?

стаичка (Bulgarian) comes from Bulgarian стая, from Bulgarian тая́, from Proto-Slavic tajiti, from Proto-Indo-European teh₂-y- — to steal.

Ancestry of “стаичка”, step by step

StepLanguageWordMeaning
1Bulgarianстаяroom, chamber
2Bulgarianтая́(the); this, this one, that, that one, the one, she
3Proto-Slavictajitito hide, conceal
4Proto-Indo-Europeanteh₂-y-to steal
Every word from Proto-Indo-European teh₂-y- →Every word from Proto-Slavic tajiti →Every word from Bulgarian тая́ →