Where does “blue green” come from?

blue green (English) comes from English blue-green, from English Blue, from Middle English blēwe, from Anglo-Norman blew, from Middle French bleu, from Old French blöe, from Latvian blāvus, from Old High German blāo — yellow, blond, grey.

blue green (English): A bluish green colour; An ecocapitalist; a person...

Definitions

  1. A bluish green colour; An ecocapitalist; a person...

Ancestry of “blue green”, step by step

blue green traces back through 3 separate lines of ancestry.

via English blue-green

StepLanguageWordMeaning
1Englishblue-greenOf a color between blue and green; darker shades...
2EnglishBlueA letterman at Oxford or Cambridge; A member of...
3Middle Englishblēwe
4Anglo-Normanblewblue
5Middle Frenchbleublue
6Old Frenchblöeblue
7Latvianblāvusaccusative plural masculine form of blāvs
8Old High Germanblāoblue, dark, grey; blue; yellow
9Proto-West Germanicblāublue
10Proto-Germanicblēwazblue; a dark bluish or grey colour, black
11Proto-Indo-Europeanbʰlēw-yellow, blond, grey

via English blue

StepLanguageWordMeaning
1EnglishblueHaving blue as its color; Depressed, melancholic,...
2Middle Englishbleweblue, azure; blue-violet; blue-grey; the colour...

via English green

StepLanguageWordMeaning
1EnglishgreenHaving green as its color; Sickly, unwell;...
Every word from Proto-Indo-European bʰlēw-Every word from Proto-Germanic blēwazEvery word from Proto-West Germanic blāu