Compounds of しが

• 恥ずかしがり屋
  (n) shy person
• 取返しがつかない
  (exp) cannot be undone
  can't be recovered from
• 取り返しがつかない
  (exp) cannot be undone
  can't be recovered from
• 思い当たるふしがある
  (exp) to have something (likely) come to mind