出難題

出难题
chūnántí
to raise a tough question

CEDICT

Entry Composition

=1 出 chū
  1. to go out; to come out
  2. to arise; to occur
  3. to produce; to yield
  4. to go beyond; to exceed
  5. (used after a verb to indicate an outward direction or a positive result)
  6. classifier for dramas, plays, operas etc
=1 出 chū variant of 出 chū (classifier for plays or chapters of classical novels)
2 難題 nántí difficult problem