Where does “blue-pencil” come from?

blue-pencil (English) comes 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, from Proto-West Germanic blāu — yellow, blond, grey.

blue-pencil (English): To edit, especially to censor, written documents;...

Definitions

  1. To edit, especially to censor, written documents;...

Ancestry of “blue-pencil”, step by step

blue-pencil traces back through two separate lines of ancestry.

via English Blue

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

via English pencil

StepLanguageWordMeaning
1EnglishpencilA paintbrush
2Old Frenchpincil
3Latinpēniculus
4Latin-culusAlternative form of -ulus; added to a noun to...
5Proto-Italic*-kelosDiminutive suffix
Every word from Proto-Indo-European bʰlēw-Every word from Proto-Germanic blēwazEvery word from Proto-West Germanic blāu