忍不住

rěnbuzhù
  1. cannot help
  2. unable to bear

CEDICT

Entry Composition

1 忍 rěn
  1. to bear
  2. to endure
  3. to tolerate
  4. to restrain oneself
2 不住 bùzhù
  1. (verb complement) unable to firmly or securely (grasp, recall etc)
  2. repeatedly; continuously; constantly