十有八九 shí yǒu bā jiǔ

DEFINITIONS

  1. most likely
  2. mostly (in 8 or 9 cases out of 10)
  3. vast majority

CHARACTERS

十 shí ten, tenth; complete; perfect
有 yǒu have, own, possess; exist
八 bā eight; all around, all sides
九 jiǔ nine