止む

1. Origins, structure, and basic meaning

• Structure: 止む, read やむ, means that an ongoing phenomenon such as rain or wind ceases.
• Basic usage: In 雨が止んだら散歩に出よう。, the speaker proposes going for a walk once the rain stops.

2. Common pitfalls and similar expressions

• A condition and a negative form
  • 止んだら makes the rain stopping a condition for the proposed action. 止まない, read やまない, is the negative form and indicates that the wind continues.