除非

chúfēi
  1. only if (..., or otherwise, ...)
  2. only when
  3. only in the case that
  4. unless

CEDICT

Entry Composition

1 除 chú
  1. to get rid of
  2. to remove
  3. to exclude
  4. to eliminate
  5. to wipe out
  6. to divide
  7. except
  8. not including
2 非 fēi
  1. to not be; not
  2. wrong; incorrect
  3. non-; un-; in-; de-
  4. to reproach; to blame
  5. (coll.) to insist on; simply must