警告

1. Origins, structure, and basic meaning

• Structure: 警告 is read as けいこく and works as a noun or する verb for a warning about danger or a problem.
• Basic usage: 警告が表示される describes an on-screen warning, while 警告する describes someone giving one.

2. Common pitfalls and similar expressions

• Linking the warning content
  • In 近づかないよう警告する, the clause before よう states the action the listener should avoid.
• Naming the problem
  • 容量不足の警告 uses の to identify insufficient capacity as the subject of the warning.