- 1
When a group of animals, plants, or people die one by one over time, until the group is gone or almost gone, they die off. We use it for whole groups, not for one person: bees are dying off, the old trees died off, that generation is slowly dying off. It has no object — nothing comes after it except maybe a time word. News reports about nature use it a lot. It sounds a little cold, so people do not usually say it about a family member.
（一群動植物或人）相繼死去、逐漸死光
原始詞典資料3 筆記錄
以下是外部詞典記錄的用法，原文照列，我們還沒有寫成教學內容。上面的說明才是我們自己寫的；有些用法可能上面已經講過了。
die offverb
- 1
To suffer a series of deaths; to die one by one; to progressively become extinct. (If a group of plants, animals, or people dies off, the entire group dies over a period of time.)
- 2
To become defunct or nonexistent.
- The student guitar club died off after a few years.
- 3
Of music, noise, etc., to reduce in volume until no longer audible.
資料來源：英文維基詞典 English Wiktionary（CC BY-SA 4.0）。 原文照列，未經改寫。