大哥

dàgē
  1. eldest brother
  2. big brother (polite address for a man of about the same age as oneself)
  3. gang leader; boss

CEDICT

Entry Composition

1 大 dà
  1. big; large; great
  2. older (than another person)
  3. eldest (as in 大姐 dàjiě)
  4. greatly; freely; fully
  5. (dialect) father
  6. (dialect) uncle (father's brother)
2 哥 gē elder brother