阻止

1. Origins, structure, and basic meaning

• Structure: 阻止 (そし) is an action noun for preventing entry, spread, or another event from occurring.
• Basic usage: 侵入を阻止した describes a gatekeeper stopping unauthorized entry, while 被害の拡大を阻止する blocks damage from spreading through early measures.

2. Common pitfalls and similar expressions

• Entry by people and escalation of harm
  • The object in 侵入を阻止する and 拡大を阻止する is the event to stop. The noun does not mean eliminating an intruder or damaged property.