措手不及

cuòshǒubùjí
no time to deal with it (idiom); caught unprepared

CEDICT

Entry Composition

1 措手 cuòshǒu
  1. to deal with
  2. to manage
  3. to proceed
2 不及 bùjí
  1. to fall short of
  2. not as good as
  3. too late