大雨

1. Origins, structure, and basic meaning

• Structure: Written 大雨 and read おおあめ, it denotes heavy rain substantial enough to affect travel or safety.
• Basic usage: It is used for rain that closes a riverside road and for a forecast risk that prompts preparation.

2. Common pitfalls and similar expressions

• Compared with an extreme downpour
  • This is a broad term for a large amount of rain and does not by itself insist on exceptionally violent intensity.