乱入

1. Origins, structure, and basic meaning

• Structure: 乱入 is read as らんにゅう and functions as a noun or intransitive verb for suddenly barging into a place or event in defiance of permission and order.
• Basic usage: Mark the destination with へ in 競技場へ乱入する and use への in the noun phrase 会議への乱入.

2. Common pitfalls and similar expressions

• More than entering
  • It is a disorderly, unexpected intrusion that disrupts an event, not ordinary entry into a field or meeting.
• Preserve the manner in translation
  • Rendering only the resulting disruption can lose the central motion of barging into the meeting.