感涙

1. Origins, structure, and basic meaning

• Structure: 感涙, read かんるい, denotes tears brought on by being deeply moved.
• Basic usage: In 十年ぶりの再会に、二人は感涙を流した。, the two people shed tears of emotion at their reunion after ten years.

2. Common pitfalls and similar expressions

• Tears and emotion
  • 涙 broadly means tears; 感涙 identifies a cause such as being moved or overwhelmed with emotion. In the example, the reunion after a long interval is the occasion.
• Noun and verb expressions
  • 感涙を流す means to shed tears of emotion; 感涙する also describes being moved to tears. 感涙した in the second example includes actual tears.