薄らぐ

1. Origins, structure, and basic meaning

• Structure: 薄らぐ (うすらぐ) is an intransitive verb for pain easing or a memory fading.
• Basic usage: 痛みが薄らいだ reports relief already felt; 記憶は薄らぐ states the gradual fading of memory over time.

2. Common pitfalls and similar expressions

• Easing sensation and fading memory
  • The changing state is the subject in both cases; the verb does not take an agent who deliberately weakens it.