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To become smaller, weaker, or quieter little by little until it stops — rain, a mountain path, a plan, a conversation. Nobody ends it; it just runs out. This probably comes from old miners' talk about a mine running dry, though nobody is fully sure.
逐漸變小而消失；無疾而終
原始詞典資料1 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。
peter outverb/ˌpiːtəɹ‿ˈaʊt/
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Synonym of peter (“to diminish to nothing, (originally) to refer to a vein of ore”).
- What started as a great effort ended up petering out to nothing.
- Q. Do you think, Doctor, that it is possible for that south strand to likewise peter out and disappear?
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。