Compounds of とが

• ことがある
  (exp) (something) has occurred
  there are times when
  to have done (something)
  such a thing happened
  (something) happens on occasions
  (P)
• ことができる
  (v1) can (do)
  to be able to (do)
  (P)
• 気がとがめる
  (exp,v1) to feel guilty
  to suffer from a guilty conscience
  to feel uneasy
  to have qualms about
  to have scruples about
  to feel regret
• 神経をとがらせる
  (exp,v1) to get on one's nerves