Where does “level best” come from?

level best (English) comes from English level, from Middle English level, from Old French livel, from Latin lībella, from Latin lībra, from Ancient Greek ζυγόν, from Proto-Hellenic dzugón, from Proto-Indo-European yugóm — to join, to yoke, to tie together.

level best (English): The very best that one can do

Definitions

  1. The very best that one can do

Ancestry of “level best”, step by step

level best traces back through two separate lines of ancestry.

via English level

StepLanguageWordMeaning
1EnglishlevelThe same height at all places; parallel to a flat...
2Middle Englishlevel
3Old Frenchlivel
4LatinlībellaAn as (the tenth part of a denarius)
5Latinlībra
6Ancient Greekζυγόνyoke, for joining animals; yoke, burden; in...
7Proto-Hellenicdzugónyoke
8Proto-Indo-Europeanyugómyoke
9Proto-Indo-Europeanyewg-to join, to yoke, to tie together

via English Best

StepLanguageWordMeaning
1EnglishBestMost; largest
2Middle EnglishbestAlternative form of beste; Alternative form of...
3Old Englishbistsecond-person singular present of bēon
4Proto-Germanicbiusisecond-person singular present active indicative...
Every word from Proto-Indo-European yewg-