cardinal sin (cardinalsins)

• 1.  

  N-COUNT（可数名词） If you describe an action as a cardinal sin, you are indicating that some people strongly disapprove of it. 重罪

  例：

  I committed the physician's cardinal sin: I got involved with my patients.

  我犯了从医的大忌：我跟病人有了感情纠葛。