潤む

1. Origins, structure, and basic meaning

• Structure: 潤む is read うるむ and is an intransitive verb describing eyes or something else becoming moist.
• Basic usage: In 別れの言葉を聞いて、彼女の目が涙で潤んだ。, her eyes fill with tears on hearing the farewell.

2. Common pitfalls and similar expressions

• The past-tense form
  • 潤んだ is the past tense of 潤む, with final む changing to んだ. 目が marks the eyes as the subject becoming moist.