Where does “trapdoor” come from?

Trapdoor comes from English trap and door, where door derives from Old English dora, Swedish trapp, ultimately from Proto-Indo-European dʰwer- meaning an opening or entrance.

trapdoor (English): A hinged or sliding door set into a floor or...

Definitions

  1. A hinged or sliding door set into a floor or...

Ancestry of “trapdoor”, step by step

trapdoor traces back through two separate lines of ancestry.

via English trap

StepLanguageWordMeaning
1EnglishtrapA machine or other device designed to catch (and sometimes kill) animals, either by holding them in a container, or by catching hold of part of the body
2Middle Englishtrappetrap
3Old Englishtræppea trap
4Proto-Germanictrap-
5Proto-Indo-Europeandreb-
6Proto-Indo-Europeander-to split, to separate; to tear, to crack, to...

via English door

StepLanguageWordMeaning
1EnglishdoorA portal of entry into a building, room, or...
2Middle EnglishdoreA door or gate structure barring an entrance
3Old Englishdorabumblebee
4Proto-Germanicdurôbumblebee, humming insect
5Proto-Indo-Europeandʰer-to support; to hold
Every word from Proto-Indo-European der-Every word from Proto-Indo-European dreb-Every word from Proto-Germanic trap-