是可忍，孰不可忍

shìkěrěn,shúbùkěrěn
  1. if this can be tolerated, what cannot? (idiom)
  2. enough is enough

CEDICT

Entry Composition

=1 是 shì
  1. to be (followed by substantives only)
  2. correct; right; true
  3. (respectful acknowledgement of a command) very well
  4. (adverb for emphatic assertion)
=1 是 shì variant of 是 shì
2 可 kě
  1. (prefix) can; may; able to; -able
  2. to approve; to permit
  3. to suit
  4. (particle used for emphasis) certainly; very
  5. but; however
3 忍 rěn
  1. to bear
  2. to endure
  3. to tolerate
  4. to restrain oneself
4 孰 shú
  1. who
  2. which
  3. what
5 不可 bùkě cannot; should not; must not
6 忍 rěn
  1. to bear
  2. to endure
  3. to tolerate
  4. to restrain oneself