break loose . escape；become free or loose 摆脱；脱开
The criminal broke loose from the police and ran into the woods．罪犯挣脱警察，逃进了树林。
During the storm，the boat broke loose from its mooring．刮风暴时，船脱开了缆绳。
break off . separate by breaking 弄碎；折掉
He broke off a piece of chocolate and offered it to me．他掰开一块巧克力递给了我。
He broke off a branch and gave it to me．他折了一根树枝，把它递给了我。
break off . end or terminate suddenly（关系、协议等）突然结束；解除
The two countries broke off their relations last month．这两个国家上个月中断了外交关系。
Unfortunately the negotiations have been broken off and are not expected to be resumed．不幸的是，谈判已中断，而且不能指望再恢复了。
The girl broke off her engagement last week．这个女孩上周解除了婚约。
break off . stop speaking；cease suddenly 中止（谈话）；突然停止
We had to break off our discussion because it was getting late．时间晚了，我们不得不中断讨论。
Jack broke off telling the story to answer the telephone．杰克中断了正在讲的故事，去接一个电话。
The conference broke off at noon．中午休会。
Bill broke off in the middle of his speech because of shouts of protest from the audience．彼尔在听众的一片抗议声中中断了发言。
break off .stop working for a short time 工间休息
Let's break off for ten minutes．我们休息十分钟吧。
The whole cast broke off for coffee in the middle of the rehearsal．在排练当中全体演员休息了一会喝咖啡。
break off .abandon；interrupt 放弃；打断
The doctor advised him to break off smoking．医生劝他戒烟。
Her intrusion broke off our conversation．她闯进来打断了我们的谈话。
break out . occur suddenly 爆发；（突然）发生
The Second World War broke out in September，nineteen thirty-nine．第二次世界大战于一九三九年九月爆发。
A fire broke out in this hotel last night．昨晚这家旅馆发生了火灾。
The economic crisis broke out first in the United States．经济危机首先在美国爆发。
Fighting has broken out on the border and is expected to continue until a settlement is reached．战斗在边界打响了，预料会继续下去直到问题得到解决。
break out . escape 逃脱
Three prisoners have broken out this week and are on the run．本周有三名囚犯越狱逃跑。
He spent several months in a Nazi concentration camp before he broke out．他在纳粹集中营里关了几个月后逃了出来。
break out . （言语或行为）突然激烈
The whole meeting broke out in cheers．整个会场爆发出阵阵欢呼声。
She broke out in tears．她突然哭了起来。
He broke out：“That is not so！”他猛然吼道：“并不是这么回事。”
He is liable to break out into furious passions．他很容易暴跳如雷。
break through . break a way through；overcome 突破；冲破；克服
The allied forces soon broke through the enemy's defence line．联军很快就突破了敌人的防线。
The soldiers have managed to break through．战士们已设法突围。
We broke through countless enemy encirclement and blockades until we finally reached northern Shanxi．我们突破了敌人无数次的包围和封锁，最后到达了陕北。
All difficulties can be broken through．一切困难都能战胜。
break through . 取得某种新成就；作出重大发现
Nuclear physicists claimed to have broken through in several new aspects of the nature of the atom．核物理学家们宣称，在有关原子本质的几个新方面已有重大突破。
Scientists hope to break through soon in their fight against heart disease．科学家们希望不久在治疗心脏病方面有所突破。
He failed many times but he finally broke through to find a successful polio vaccine．他失败了许多次，但最终成功地发现了预防小儿麻痹症的疫苗。
break through . make an appearance出现
A little later the sun broke through the clouds．一会儿太阳就钻出了云层。
break up . 打破；弄碎；拆开
She broke up the glass in her search for money．她在找钱时把玻璃打碎了。
He can break up that stone with his hand．他用手能打碎那块石头。
break up . end for a holiday（学校期终）放假
The boys will break up for the Christmas vacation next week．孩子们下周放圣诞假。
When does the school break up for the summer holidays？学校什么时候放暑假？
We break up on July twenty-fifth．我们七月二十五日放假。
break up . end；stop 结束；停止
The party broke up at midnight．晚会在午夜结束。
What time is the meeting expected to break up？会议可望在几点钟结束？
He broke up the fight between the two gangs．他制止了两伙人打架。
A fight started in that street last night，so the police were called in to break it up．昨晚在那条马路上发生了一起斗殴事件，人们把警察叫来制止。
break up . become weak；upset completely （指人）身体衰弱；完全搅乱
He may break up under all these troubles．遇到这么多麻烦，他可能会垮下来。
This trouble has really broken him up．这件麻烦事确实使他心烦意乱。
break up . 精神崩溃（常用于被动语态）
She was all broken up after her daughter's death，and did not go out of the house for two months．她在女儿死后精神崩溃了，有两个月没有出家门。
break up . stop being friends；separate绝交
Mary and John were good friends，but then they had a quarrel and broke up．玛丽和约翰原来是好朋友，但后来吵了一架便绝交了。