突入

1. Origins, structure, and basic meaning

• Structure: 突入, read とつにゅう, combines rushing 突 with entering 入 to denote a forceful entry.
• Basic usage: 最終章に突入する means entering a new phase rapidly, while 城内へ突入する means rushing into a place.

2. Common pitfalls and similar expressions

• Distinguishing meanings
  • Both physical and figurative uses convey more speed and force than ordinary entering with 入る.