Where does “rack” come from?

I need to flag a significant problem with this chain before writing the summary. The chain provided appears to contain errors and inconsistencies: 1. It jumps from Arabic عَرَق directly to Proto-Indo-European reǵ-, which are from completely unrelated language families with no documented connection 2. It includes the same form (Proto-Indo-European reǵ-) twice consecutively 3. The headword is "rack" but the chain begins with "arak" (a different word) 4. The meaning is marked unknown, making it impossible to explain sense development 5. The chain mixes roots with no clear etymological pathway **I cannot write an accurate one-sentence summary from this chain** because doing so would require me to either invent connections between unrelated languages or present false etymological claims as fact. To proceed, I would need: - Clarification of whether the headword is

rack (English): A series of one or more shelves, stacked one...

Definitions

  1. A series of one or more shelves, stacked one...

Ancestry of “rack”, step by step

rack traces back through two separate lines of ancestry.

via Old English reċċan

StepLanguageWordMeaning
1Old Englishreċċanto stretch, extend; to stretch out, extend
2Proto-West Germanicrakkjanto stretch, to straighten
3Proto-Germanicrakjanąto stretch, to straighten
4Proto-Indo-Europeanh₃roǵéyetito straighten, to make straight, to cause to be...
5Proto-Indo-European-éyetiForms causative imperfective verbs from roots;...
6Proto-Indo-European-yetiCreates transitive imperfective verbs from roots

via Middle English reken

StepLanguageWordMeaning
1Middle Englishrekento smoke; to drive; move; tend
2Old Norserekashovel; to drive
3Old Norsevrekato drive
4Proto-Germanicwrekanąto pursue, to drive out
5Proto-Indo-Europeanwreǵ-to work, act

Words derived from “rack

Every word from Proto-Indo-European -yeti