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To propound an idea is to put it out for other people to look at and think about — a theory, an explanation, a way of seeing a problem. You are not asking them to vote yet; you are asking them to consider it. A scientist might propound a theory; a lawyer might propound a reading of an old rule. Though actually, almost nobody says this at the dinner table. It is a , slightly old, slightly legal word. A friend would just say “I think…” or “what if…”. It is a close cousin of propose — they come from the same Latin “put forward” — but propose is the living everyday word, and propound kept the heavier coat. Do not mix it with expound, which is to explain something at length. Propound is the putting-forward; expound is the .
提出（一個理論或說法，供人考慮）
組成From Middle English proponen, from Latin prōpōnere, “to put forward”: prō- “before” + pōnere “to put”. It is a doublet of propose — same Latin root, different path into English.
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。
propoundverb/prəˈpaʊnd/
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To put forward; to offer for discussion or debate.
- Today I'll expound at length the theory that I propounded last year.
- “Divine receptacle of excellence, let it not be deemed impertinent, or deviating from the rules of propriety, if I propound one queſtion which now labours in my breaſt; aſſuring me firſt, you will not let the ſceptre of true judgment depart from your right hand.”
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。