1
break in (intransitive)
不及物用法，常与介词through连用表示闯入途径。
The burglar broke in through the back door.
窃贼从后门闯入。
闯入；破门而入
broke in — past of break in · irregular form
先理解核心含义，再看它在真实句子里的用法。
闯入；破门而入
To enter a place by force or illegally.
The burglar broke in through the back door.
窃贼从后门闯入。
强行或非法进入某处。
To enter a place by force or illicit means.
向内用力猛击使其破碎。
To smash (something) by forcing it inward.
开始全新的事物或达到新的水平。
Starting something brand new or at a new level.
驯服；使顺从；训练听从主人命令。
To tame; make obedient; to train to follow orders of the owner.
break in
Base
原形
breaks in
3rd person
第三人称单数
breaking in
-ing
现在分词
broke in
Past
过去式
broken in
Past participle
过去分词
He breaks in new shoes by wearing them around the house.
他通过在家里穿着新鞋来使它们逐渐合脚。
The thief broke in through the back door.
小偷从后门闯入。
I have broken in these boots, and now they are comfortable.
我已经穿惯了这双靴子，现在很舒服了。
不及物动词短语（闯入）或及物用法（训练、使合用）
The burglar broke in through the back window.
窃贼从后窗闯了进来。
I'm sorry to break in, but I have an urgent message for you.
抱歉打断一下，我有紧急消息要告诉你。
I need to break in these new boots before the hiking trip.
远足之前我得先磨合一下这双新靴子。
不及物用法，常与介词through连用表示闯入途径。
The burglar broke in through the back door.
窃贼从后门闯入。
及物用法，宾语为被训练的人或需磨合的物体。
I need to break in my new hiking boots before the trip.
我需要在这趟旅行前把新登山靴穿合脚。
常与介词on连用，表示打断某人正在进行的事。
Sorry to break in on your conversation, but I have an urgent message.
抱歉打断你们的谈话，但我有紧急消息。
Not this
The thief broke in the house.
Use this
The thief broke into the house.
表示“闯入”时，break in 是不及物动词短语，不能直接接地点名词，需加介词 into 才能接宾语。
Not this
He broke in our conversation.
Use this
He broke into our conversation.
表示“打断（谈话）”时，break in 通常不直接接宾语，需用 break into 或 break in on 来引入被打断的事物。
Focus on the distinctions below. Other candidates are kept compact until a reliable usage note is available.
磨合新鞋
It takes a few days to break in new shoes.
磨合新鞋需要几天时间。
驯马
The cowboy is breaking in a wild horse.
牛仔正在驯一匹野马。
培训新员工
We need to break in the new employee quickly.
我们需要快速培训新员工。
闯入
The burglar broke in through the back door.
窃贼从后门闯入。
打断谈话
Sorry to break in on your conversation, but I have an urgent message.
抱歉打断你们的谈话，但我有紧急消息。
闯入
The burglar broke in through the window.
窃贼从窗户闯入。
打断
Sorry to break in on your conversation, but I have an urgent message.
抱歉打断你们的谈话，但我有紧急消息。
训练；使适应
It takes time to break in a new pair of shoes.
新鞋需要时间才能穿得合脚。
Use broke in naturally, then get feedback on meaning, tone, grammar, and phrasing.
Revisit a common error or keep this word in your review list.
想象新鞋需要‘break in’（磨合），就像打破（break）进入（in）舒适状态；或强盗撞破（break）门进入（in）——闯入。
此义项（闯入）常用于描述非法进入建筑物或场所的情景，适用于口语及新闻报道，语气较为直接。注意与‘打断’等义项区分。
可作及物或不及物动词，及物时表示训练或使合用，不及物时表示闯入或打断。
Dictionary facts from ECDICT, WIKTIONARY.