遺恨

1. Origins, structure, and basic meaning

• Structure: 遺恨 is read いこん and is a noun for a grudge or resentment that lingers because of a past event.
• Basic usage: Express abandoning an old grudge with 長年の遺恨を捨てる and leaving resentment behind with 遺恨を残す.

2. Common pitfalls and similar expressions

• A lingering feeling
  • Even with 残す, this is not a physical object being left behind; it is resentment that continues after a conflict.
• 遺恨 and 恨み
  • 恨み(うらみ) broadly denotes resentment in everyday language. 遺恨 is relatively literary and formal, emphasizing a grudge inherited from or prolonged by a past event.
• Ending a dispute and ending resentment
  • Cooperation or a handshake does not automatically prove that all resentment disappeared. The examples also state the parties' intention to abandon it or avoid leaving it behind.