Where does “doolally tap” come from?

doolally tap (English) comes from English tap, from Middle English tappe, from Middle English tappen, from Old English tæppian, from Old English -ian, from Old English -ōjan, from Proto-West Germanic -ōn, from Proto-Germanic -ōną — he, she.

doolally tap (English): Camp fever; by extension, madness, eccentricity;...

Definitions

  1. Camp fever; by extension, madness, eccentricity;...

Ancestry of “doolally tap”, step by step

doolally tap traces back through two separate lines of ancestry.

via English tap

StepLanguageWordMeaning
1EnglishtapA tapering cylindrical pin or peg used to stop...
2Middle EnglishtappeA spigot or plug for a hole or spout; A hole or...
3Middle EnglishtappenTo let fluids flow from a spout; To retail beer;...
4Old Englishtæppianto tap
5Old English-ianForms verbs from nouns and adjectives
6Old English-ōjan—
7Proto-West Germanic-ōnCreates denominative verbs from nouns; Creates...
8Proto-Germanic-ōnąCreates denominative verbs from nouns; Creates...
9Proto-Indo-European-eh₂yétiCreates iterative/ frequentative/ intensive...
10Proto-Indo-European-yétiCreates intransitive, often deponent,...
11Proto-Indo-Europeanyé-—
12Chichewaiyehe, she

via English Deolali

StepLanguageWordMeaning
1EnglishDeolali—

Words derived from “doolally tap”

Every word from Chichewa iye →Every word from Proto-Indo-European -yéti →Every word from Proto-Germanic -ōną →