大姐

dàjiě
  1. big sister
  2. elder sister
  3. older sister (also polite term of address for a girl or woman slightly older than the speaker)

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 姐 jiě older sister