Etymology

full-on

Today it means: All-out; out and out; complete; utter. Full definition →

English on ← Middle English on ← Old English on
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The story

  1. Englishfull-
  2. Proto-Indo-European*h₂en-
  3. Proto-Germanic*an
  4. Proto-West Germanic*ana
  5. Old Englishon
  6. Middle Englishon
  7. Englishon
  8. English todayfull-on

From full- (“fully, completely”) + on.

Etymology from Wiktionary, CC BY-SA 4.0.