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Undersubscribed means that fewer people signed up, applied, or bought than were wanted or expected. It is used about things that have a number of places to fill: a share offer, a class, a training course, a conference, a charity appeal, a housing scheme, a bond sale. If a course had thirty seats and eight students , that course is undersubscribed. The word began in finance — when a company sells new shares and investors do not ask for all of them, the issue is undersubscribed, and that is bad news about how much people believe in it — and spread out to education and events. It is a formal, institutional word: universities, banks, and organisers use it; friends do not. Its opposite, oversubscribed, is honestly the word of the pair, because places running out is the more newsworthy event. The verb 'subscribe' behind it is not the modern YouTube sense but the older one, 'to put your name down for something', which is also why 'subscription' means both a magazine deal and a promise to pay in. A quiet implication worth noticing: calling something undersubscribed usually hints that it may be cut, cancelled, or repriced.
認購不足的、報名人數不足的（股票發行「認購不足」；課程活動「報名不足額」）
組成under- (fewer than needed) + subscribed, from subscribe: Latin sub- 'under' + scribere 'to write' — literally to write your name underneath, the old way of committing to something.
同家族的字
- subscribethe base verb, sub- 'under' + scribere 'to write'
- describesame Latin scribere 'to write'
- manuscriptscribere again — something written by hand
- oversubscribedthe opposite: more applicants than places
原始詞典資料2 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。
undersubscribedadj詞源 1
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Having too few subscribers or subscriptions.
這個拼法也被記錄為下列字的變化形：
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。