Where does “dummy light” come from?

dummy light (English) comes from English dummy, from English dumb, from English damn, from Middle English dampnen, from Old French dampner, from Latin damnō, from Latin damnum, from Proto-Italic dapnom — to share, divide.

dummy light (English): Synonym of idiot light; A type of stop light set...

Definitions

  1. Synonym of idiot light; A type of stop light set...

Ancestry of “dummy light”, step by step

dummy light traces back through two separate lines of ancestry.

via English dummy

StepLanguageWordMeaning
1EnglishdummyA silent person; a person who does not talk; An...
2EnglishdumbUnable to speak; lacking power of speech; Silent;...
3EnglishdamnTo condemn to hell; To condemn; to declare...
4Middle Englishdampnento damn
5Old Frenchdampnerto damn
6Latindamnōto discredit, find fault, disapprove, reject
7Latindamnumdamage or injury; loss; a fine
8Proto-Italicdapnom
9Proto-Indo-Europeandh₂pnómexpense, investment
10Proto-Indo-Europeandeh₂p-to sacrifice; to lose
11Proto-Indo-Europeandeh₂-to share, divide

via English Light

StepLanguageWordMeaning
1EnglishLightA place name
2Middle EnglishlightThe radiation which allows for vision by...
3Old Englishlēohtluminous, bright, light, clear, resplendent,...
4Proto-West Germanicleuhtlight, bright; light
5Proto-Germanicleuhtąlight
6Proto-Indo-Europeanlewktom
7Proto-Indo-Europeanlewk-bright; to shine; to see
Every word from Proto-Indo-European deh₂-Every word from Proto-Indo-European deh₂p-Every word from Proto-Indo-European dh₂pnóm