Etymology

big-brotherly

Today it means: Of or characteristic of older brothers. Full definition →

Proto-Germanic *līką ← Proto-Indo-European *leyg- ← English big brother
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The story

  1. Englishbig brother
  2. Proto-Indo-European*leyg-
  3. Proto-Germanic*līką
  4. English todaybig-brotherly

From big brother + -ly (adjectival suffix).

Etymology from Wiktionary, CC BY-SA 4.0.