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A run-in is a clash with someone — an argument or a nasty bit of trouble — especially with a person who has some official power: the police, a teacher, a manager, a security guard. “He had a run-in with the police” does not mean they had a chat; it means things got sharp. It is informal. You have a run-in; you do not usually “do” a run-in.
A run-in isrun-in 指的是 a clash with someone跟某人起的衝突—— an argument or a nasty bit of trouble可能是爭執，也可能是不愉快的麻煩——especially with a person who has some official power尤其是跟有點官方權力的人，像是：the police警察、a teacher老師、a manager主管、a security guard警衛。"He had a run-in with the police""He had a run-in with the police."（他跟警察起了衝突） does not mean they had a chat不是說他們聊了個天；it means things got sharp而是說事情鬧僵了。It is informal這是口語用法。You have a run-in你會說"have"一個 run-in；you do not usually "do" a run-in通常不會說"do"一個 run-in。
Though actually, this run-in is a noun, born from the verb run into (you run into trouble, or into someone).
Though actually不過其實，this run-in is a noun這裡的 run-in 是名詞，born from the phrasal verb run into源自片語動詞 run into （you run into trouble, or into someone）（你 run into 麻煩，或 run into 某人）。
It is not the same as running in a new car, and not the same as the sports “run-in” meaning the last stretch before the finish. Those are different lives of similar words. This one is the disagreement.
It is not the same as它跟 running in a new carrunning in（讓新車的引擎磨合）不一樣，and not the same as the sports "run-in"也跟體育用語裡的"run-in" meaning the last stretch before the finish（指終點前最後一段路）不一樣。Those are different lives of similar words這些是拼法相似、但各自有不同用法的詞。This one is the disagreement這裡講的這個，指的就是那種衝突。
組成Derived from the verb run into.
同家族的字
- run intothe phrasal verb this noun comes from: you run into trouble, or into a person, and a run-in is that clash
原始詞典資料5 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。
run-innoun詞源 1/ˈɹʌnˌɪn/
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An encounter; a scrape or brush, especially one involving trouble or difficulty.
- During that time he had two more run-ins with the law. One involved the sale of stolen property. The other was for a series of hot checks.
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The end-phase of a competition etc.
- Yahoo Sport's Leicester City blogger Helen Nutter gets ready for the Premier League run-in knowing her side - incredibly - still have a great chance of being crowned champions
- But despite its plague of tunnels, the run-in on this route is of unusual interest to the locomotive enthusiast: besides the hordes of self-important saddle-tanks shunting in the extensive yards, there was at one time the chance of seeing those slender little North London engines, with their large outside cylinders and no visible storage place for coal, and also an occasional South Eastern locomotive sporting a lot of polished brass.
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A sudden compression between two coupled railcars when the hinder one is moving faster than the fore one.
- Brake pipe pressure reduction rates of over 30 psi/sec lasting for about 15 milliseconds were created by harsh slack run-ins.
- Researchers noted no unusual events (e.g., knuckle breaks) or notable instances of significant slack action or run-ins/run-outs at the lead locomotive during the test.
run-inadj詞源 2/ˈɹʌnˌɪn/
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communicationseditingjournalism(not comparable) Having been run in before or behind previous text.
- These headings are of the run-in type because a free-hanging style would just be a waste of column inches.
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engineeringmechanicalmechanical-engineering(sometimes comparable) Having been run in to seat the parts.
- A well run-in engine is likelier to consume less crankcase oil over the course of its working life.
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。