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In American English, a teamster is a truck driver — someone who drives a big for a living. It is an American word; British people do not really use it, and it sounds a bit old-fashioned and working-class even in the US, the sort of word you meet in a news story or a film rather than in everyday talk. Where it comes from is the interesting part. Long before trucks, a 'team' meant a team of horses or oxen pulling a wagon, and the man who drove them was the teamster. When engines replaced animals, the word simply moved across to the new machine and stayed. That is why the job changed completely but the name did not. In practice you will most often see it capitalised — a Teamster, meaning a member of the big American truck drivers' union — and that is a slightly different thing from the plain job word.
（美）卡車司機（早期指趕馬車的車伕）
組成team + -ster. Here 'team' is the older meaning: a set of animals harnessed together to pull. '-ster' is an old English ending meaning 'a person who does this' — it survives in a small group of job words.
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。
Teamsternoun/ˈtim.stɚ/
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A member of the Teamsters labour union, usually a truck driver.
teamsternoun/ˈtim.stɚ/
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A person who drives a team of animals (such as horses or oxen).
- Dirty boys playing in the ditch, clerks, teamsters, riders, loungers on the comers, ranchers on dusty horses, little girls running errands, and women hurrying to the stores all looked up at her coming with glad eyes.
- He turned to the man who spoke. He wore long moustaches after the fashion of teamsters and he wore a widebrim hat with a low round crown.
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A person who drives a cargo truck (see Teamster).
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。