Where does “tailfirst” come from?

tailfirst (English) comes from English First, from Middle English first, from Old English fyrst, from Proto-Germanic frestaz, from Proto-Indo-European pres-, from Proto-Indo-European per-, from Proto-Indo-European pr̥tós — passed , crossed.

tailfirst (English): With the tail in front

Definitions

  1. With the tail in front

Ancestry of “tailfirst”, step by step

tailfirst traces back through two separate lines of ancestry.

via English First

StepLanguageWordMeaning
1EnglishFirstPreceding all others of a series or kind; the ordinal of one; earliest
2Middle Englishfirstfirst
3Old EnglishfyrstAlternative form of fierst; Alternative form of...
4Proto-Germanicfrestaz
5Proto-Indo-Europeanpres-to press
6Proto-Indo-Europeanper-before, in front; first; to go through
7Proto-Indo-Europeanpr̥tóspassed , crossed

via English Tail

StepLanguageWordMeaning
1EnglishTailA Chinese constellation coinciding with the tail of Scorpius, one of the 28 lunar mansions and the tail of Azure Dragon
2Middle EnglishtaylA tail; The back side or reverse of a creature; A...
3Old Englishtæġltail
4Proto-Germanictagląhair; ponytail; hair of a tail; tail
5Proto-Indo-Europeandoḱ-hair of the tail
6Proto-Indo-Europeandeḱ-take; perceive
Every word from Proto-Indo-European pr̥tós