Where does “dog eat dog” come from?

dog eat dog (English) comes from English dog, from English dogshit, from English shit, from Middle Dutch schite, from Old Dutch skīta, from Old Saxon skiti, from Proto-Germanic skītaz, from Proto-Indo-European sḱeyd- — to cut, part, spearate, divide; to cut, part,...

dog eat dog (English): Ruthlessly acquisitive or competitive. Describes...

Definitions

  1. Ruthlessly acquisitive or competitive. Describes...

Ancestry of “dog eat dog”, step by step

dog eat dog traces back through two separate lines of ancestry.

via English dog

StepLanguageWordMeaning
1EnglishdogA mammal, "Canis familiaris" or "Canis lupus...
2EnglishdogshitDog excrement; Something disgusting, abominable,...
3EnglishshitSolid excretory product evacuated from the...
4Middle Dutchschite
5Old Dutchskīta
6Old Saxonskiti
7Proto-Germanicskītaz
8Proto-Indo-Europeansḱeyd-to shade; to cut off; to part with, separate, cut...
9Proto-Indo-Europeansḱēy-to shine; to shimmer; shadow; luster, gloss,...
10Proto-Germanicskaidąseparation, distinction
11Proto-Indo-EuropeanskÁit-to cut, part, spearate, divide; to cut, part,...

via English eat

StepLanguageWordMeaning
1EnglisheatTo ingest
2Middle EnglishetenTo eat, devour; To consume or have a meal; To...
3Old Englisheotengiant, monster
4Proto-Germanicetunazan overeater, glutton; a giant
5Proto-Germanicetanąto eat
6Proto-Indo-Europeanh₁édtito eat
7Proto-Indo-Europeanh₁ed-to eat
Every word from Proto-Indo-European skÁit-