Etymology

full-bore

Today it means: Having a relatively large caliber. Full definition →

English bore ← Middle English boren ← Old English borian
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The story

  1. Englishfull
  2. Proto-Indo-European*bʰerH-
  3. Proto-Germanic*burōną
  4. Proto-West Germanic*borōn
  5. Old Englishborian
  6. Middle Englishboren
  7. Englishbore
  8. English todayfull-bore

From full + bore (“the barrel of a gun”).

Etymology from Wiktionary, CC BY-SA 4.0.