愛用

1. Origins, structure, and basic meaning

• Structure: 愛用, read あいよう, denotes regularly and favorably using an item over a long period.
• Basic usage: It describes regularly using a fountain pen for years and a bag favored by one’s father.

2. Common pitfalls and similar expressions

• Regular, favored use
  • It means favoring and using something regularly over time, not trying it once or twice.