盟友

1. Origins, structure, and basic meaning

• Structure: 盟友 is read as めいゆう and means “close ally” and “kindred friend”.
• Basic usage: It refers to a trusted longtime ally and two kindred friends joining forces.

2. Common pitfalls and similar expressions

• Key distinction: 若い頃からの盟友
  • It is a close ally bound by shared purpose and trust, not a casual acquaintance. 若い頃からの盟友 states the duration.