Where does “pigeonhole” come from?

I appreciate the detailed instructions, but I need to flag a critical issue with this chain: it appears internally inconsistent and doesn't actually support the word "pigeonhole." The chain shows: - English hole → Middle English hole → Old English hol → Old English helan → Latin oleum → Ancient Greek ἔλαιον → Latin oleum → PIE -kos This sequence has "Latin oleum" appearing twice, shifts unexpectedly between "hole/hol/helan" (which relate to "hollow/conceal") and "oleum" (which means "oil"), and doesn't explain how we arrive at "pigeonhole" at all. **I cannot write an accurate one-sentence summary because the chain doesn't support the headword.** To proceed, I would need: 1. Clarification of whether "pigeonhole" should trace through "hole" or "pigeon"

pigeonhole (English): One of an array of compartments for housing...

Definitions

  1. One of an array of compartments for housing...

Ancestry of “pigeonhole”, step by step

pigeonhole traces back through two separate lines of ancestry.

via English pigeon

StepLanguageWordMeaning
1EnglishpigeonOne of several birds of the family Columbidae,...
2EnglishbusinessA specific commercial enterprise or...
3Middle Englishbusines
4Old Englishbisiġnesbusiness, busyness
5Old English-nesUsed to form abstract nouns, usually from...
6Proto-West Germanic-nassīUsed to form abstract nouns, usually from...
7Proto-Germanic-inassuz-ness
8Proto-West Germanic-ness, -th
9Proto-Germanic-į̄-th
10Proto-Indo-European-íh₂
11Proto-Indo-European-h₂Creates collective nouns, which refer to groups...

via English hole

StepLanguageWordMeaning
1EnglishholeA hollow place or cavity; an excavation; a pit;...
2Middle Englishholehealthy; safe; whole, complete, full
3Old Englishhola hole, a hollow; calumny; slander
4Proto-West Germanicholhollow; hole
5Proto-Germanichuląa hollow; depression; hole
6Proto-Germanichulazhollow
7Proto-Indo-Europeanḱel-to cover; to incline

Words derived from “pigeonhole

Every word from Proto-Indo-European -h₂Every word from Old English -nesEvery word from Proto-Germanic -į̄