前進

1. Origins, structure, and basic meaning

• Structure: 前進 (ぜんしん) is an action noun for forward movement and, figuratively, meaningful improvement.
• Basic usage: 隊列が前進した reports a formation physically moving forward after a signal, while 改善が前進になる evaluates a small improvement as significant progress.

2. Common pitfalls and similar expressions

• Physical advance and abstract progress
  • ゆっくり前進する can have a physical speed, whereas 大きな前進になる evaluates the scale of an improvement. No literal direction or distance is asserted in the second.