Picture the hours a person normally gives to work or study in one week as a single container. Full-time can be thought of as that container being filled right up, with nothing left over. Everything the word does comes from that picture: the job that fills it, the student whose week is filled, and the joke about a puppy that fills it without paying you.
From the word’s history
Wiktionary gives the origin simply as full + time, which matches the modern picture: a time that is full.
來源把這個字的組成寫成 full 加 time，也就是「滿的時間」。這跟今天的用法對得上：時數被填滿。
Wiktionary (kaikki snapshot 3f6f69a190036ae4), full-time, adj: From full + time.
原始詞典資料2 筆記錄
以下是外部詞典記錄的用法，摘錄並精簡格式，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。
full-timeadj/ˌfʊl ˈtaɪm/
- 1
Involving a full amount of time spent on some activity, especially a job.
- I have a full-time job, working five days a week.
- Bringing up a child is a full-time activity.
full-timeadv/ˌfʊl ˈtaɪm/
- 1
Spending a full amount of time.
- to work full-time
- Area Boards are wholly part-time, but their Chairmen are members of the Commission and may work full-time in that capacity.
摘錄自 英文維基詞典 English Wiktionary，已精簡格式；依 CC BY-SA 4.0 授權使用，改動後的內容同樣以此授權提供。