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A shyster is a dishonest person, most often a lawyer, sometimes a businessman, who cheats people and plays dirty with the rules. It is an informal American insult, not a job title, and it is rude. You will meet it in films, crime stories, and sharp talk about people who cannot be trusted, more than in careful British English. Though actually, it is not the same word as Shylock, and it does not come from that play, even though both can turn up in talk about money and bad dealing.
訟棍；奸商
組成US word from the 1800s; people do not agree where it comes from. The Oxford English Dictionary calls the origin obscure: it may be an old sense of shy meaning “not respectable,” plus -ster (the ending in words like trickster). Other people say it comes from shicer, from German Scheißer (“a worthless person”), from scheißen (“to defecate”), probably pulled toward -ster. It is not related to Shylock.
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。
shysternoun/ˈʃaɪs.tə(ɹ)/
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Someone who acts in a disreputable, unethical, or unscrupulous way, especially in the practice of law and politics.
- True, it was a good advertisement at Boosters' Club lunches, and all the varieties of Annual Banquets to which Good Fellows were invited, to speak sonorously of […] a thing called Ethics, whose nature was confusing but if you had it you were a High-class Realtor and if you hadn't you were a shyster, a piker, and a fly-by-night.
- The network canceled—nonco-operation their legal shysters said. Suing me, for, for ten million clams, damages to sponsors, agencies. Internal Revenue-Uncle Whiskers says I owe them a mint.
shysterverb/ˈʃaɪs.tə(ɹ)/
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To act in a disreputable, unethical, or unscrupulous way, especially in the practice of law and politics.
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To exploit (someone or something) in this way.
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。