1
overhaul sth
动词用法：及物动词，后直接接检修对象，常用于机器、车辆或系统。
The technicians will overhaul the entire heating system.
技术人员将彻底检修整个供暖系统。
大检修；大修
先理解核心含义，再看它在真实句子里的用法。
大检修；大修
periodic maintenance on a car or machine
The technicians will overhaul the entire heating system.
技术人员将彻底检修整个供暖系统。
大修、翻新或修订
A major repair, renovation, or revision.
对汽车或机器的定期维护
periodic maintenance on a car or machine
火灾扑灭后,消防员搜寻建筑物内可能引起复燃的热点的过程
The process after the fire appears extinguished in which the firefighters search the structure for signs of hot spots that may cause the structure to reignite.
通过更新和修复来改进
the act of improving by renewing and restoring
The mechanic had to overhaul the old engine before the car could pass inspection.
机械师必须彻底检修这台旧发动机，汽车才能通过检查。
AI contextual example
We are overhauling the factory's old conveyor belts this weekend.
这个周末我们正在彻底检修工厂的旧传送带。
AI contextual example
The airline overhauled all of its jets after the safety report.
安全报告发布后，这家航空公司彻底检修了旗下所有喷气式飞机。
AI contextual example
it was time for an overhaul on the tractor
拖拉机该大修了。
WordNet
动词用法：及物动词，后直接接检修对象，常用于机器、车辆或系统。
The technicians will overhaul the entire heating system.
技术人员将彻底检修整个供暖系统。
名词用法：an overhaul of ... 表示“对……的大检修”，介词用 of。
The government promised a thorough overhaul of the healthcare system.
政府承诺对医疗体系进行一次彻底的大检修。
undergo an overhaul 是常用搭配，表示“接受或经历大检修”，主语通常是被检修的对象。
The company's website is undergoing a complete overhaul.
该公司的网站正在经历一次全面的大检修。
Not this
My car needs overhaul.
Use this
My car needs an overhaul.
overhaul 作名词时是可数名词，表示“一次大修”，前面需要不定冠词 an。needs overhaul 把 overhaul 误当作不可数名词，缺少冠词，因此应说 needs an overhaul。
Not this
The government made an overhaul to the tax system.
Use this
The government carried out an overhaul of the tax system.
overhaul 作名词时搭配动词常用 carry out/undertake，不用 make；表示“对……的检修”时用介词 of，不用 to。因此“对税制进行大修”应说 carried out an overhaul of the tax system。
Not this
My car overhauled last week.
Use this
My car was overhauled last week.
overhaul 是及物动词，后面必须接宾语；这里“车”是被检修的对象，所以要用被动语态 was overhauled，不能照中文“车大修了”直接把 overhauled 当不及物动词用。
Focus on the distinctions below. Other candidates are kept compact until a reliable usage note is available.
大修
The car needs a major overhaul.
这辆车需要大修。
彻底检修
The software is due for a complete overhaul.
该软件需要进行彻底检修。
发动机大修
An engine overhaul can be very costly.
发动机大修可能非常昂贵。
彻底改革系统
They plan to overhaul the entire system next year.
他们计划明年彻底改革整个系统。
进行大修
The school underwent a major overhaul.
这所学校进行了大修。
需要全面检修；急需彻底改革
The city's public transport system is in serious need of an overhaul.
这座城市的公共交通系统亟需全面检修。
对……进行彻底改造或检修
We gave the hiring process a complete overhaul last year.
去年我们对招聘流程进行了彻底改革。
接受全面检修；经历重大改革
The outdated law will undergo a major overhaul next year.
这项过时的法律明年将进行重大修订。
Use overhaul naturally, then get feedback on meaning, tone, grammar, and phrasing.
Revisit a common error or keep this word in your review list.
over（全部）+ haul（拖、拉）→ 想象把整台机器全部拖去检修，即“大修、翻修”。
语域：neutral 常见场景：汽车维修、机械维护、设备检修 该义项多用于车辆、机器或设备的定期检修场景，属于中性偏正式的用法；在日常口语中有时也用，但更常见于技术或维护语境。
在 'overhaul' 中，结尾的 'haul' 读作 /hɔl/，与以下词的 '-all' 部分押韵：hall (/hɔl/)、ball (/bɔl/)、call (/kɔl/)、fall (/fɔl/)、tall (/tɔl/)、wall (/wɔl/)。注意 'haul' 拼写为 'au'，但发音与 'hall' 相同。注意区分：'haul' 不像 'howl' (/haʊl/) 或 'hail' (/heɪl/)，它们看起来相似但读音不同。
Dictionary facts from ECDICT, WIKTIONARY.