Where does “спинка” come from?

спинка (Russian) comes from Russian спина́, from Polish spina, from Latin spīna, from Proto-Italic speinā, from Proto-Indo-European spēy- — to stretch; thrive; succeed.

спинка (Russian): back of a chair, couch or other furniture, of a dress or a shirt, of a tool, of an animal, or as a cut of meat; headboard; backrest

Definitions

  1. back of a chair, couch or other furniture, of a dress or a shirt, of a tool, of an animal, or as a cut of meat; headboard; backrest

Ancestry of “спинка”, step by step

спинка traces back through two separate lines of ancestry.

via Russian спина́

StepLanguageWordMeaning
1Russianспина́back, ridge
2Polishspinasudden jitters or anxiety; Augmentative of...
3Latinspīnaa thorn or a thorny tree or shrub, such as whitethorn, hawthorn, or blackthorn
4Proto-Italicspeināthorn
5Proto-Indo-Europeanspēy-to stretch; thrive; succeed

via Ukrainian спина

StepLanguageWordMeaning
1Ukrainianспинаback
Every word from Proto-Indo-European spēy-Every word from Proto-Italic speināEvery word from Latin spīna