後悔

1. Origins, structure, and basic meaning

• Structure: 後悔, read こうかい, denotes the later feeling that a past action or omission was wrong or unfortunate.
• Basic usage: It covers regretting a past failure to apologize and acting fully now to avoid later regret.

2. Common pitfalls and similar expressions

• Looking back on a past choice
  • It is the later feeling that a past action or omission was wrong or unfortunate.