除了您提供的常见短语和习语之外，还有一些 "back" 相关的短语和习语在英语中很常用，它们可以表达各种不同的含义。以下是一些例句：
1. 表达支持或鼓励
have someone's back: 支持或捍卫某人，特别是在困难的情况下。
Example: I always have my friends' backs, no matter what. 我总是支持我的朋友，无论发生什么。
pat on the back: 鼓励或表扬。
Example: The teacher gave her a pat on the back for her excellent成績。老师因为她优异的成绩表扬了她。
stand behind someone: 支持某人的决定或行动。
Example: The company stands behind its employees, even when they make mistakes. 公司支持其员工，即使他们犯了错误。
2. 表达困难或挑战
against the ropes: 处于困境或劣势。
Example: The boxer was against the ropes in the final round, but he managed to pull off a victory. 拳击手在最后一轮处于劣势，但他设法取得了胜利。
bend over backward: 竭尽全力取悦或帮助某人。
Example: The staff bent over backward to accommodate our special requests. 为了满足我们的特殊要求，工作人员竭尽全力。
break someone's back: 给某人带来很多工作或努力。
Example: The new regulations have broken the backs of small businesses. 新规定给小企业带来了沉重的负担。
have one's back against the wall: 处于艰难或具有挑战性的境地。
Example: The company's financial problems have kept them with their backs against the wall. 公司的财务问题使他们陷入了困境。
3. 表达退缩或逃避
back down: 退出挑战、战斗或争论。
Example: The bully backed down when he saw the police officer approaching. 当他看到警察走近时，恶霸退缩了。
back out (of something): 退出承诺、协议或计划。
Example: She backed out of the deal at the last minute. 她最后一刻退出了交易。
cop out (of something): 逃避责任或义务。
Example: He always finds a way to cop out of his chores. 他总是找到逃避家务的方法。
turn one's back on: 拒绝帮助或支持某人。
Example: I can't turn my back on him when he needs help. 在他需要帮助的时候，我不能不管他。
4. 表达其他含义
back and forth: 反复来回。
Example: The two teams went back and forth for the lead all game. 两队整场比赛都交替领先。
back in time: 回到过去。
Example: I wish I could go back in time and change some things. 我希望我能回到过去改变一些事情。
back on track: 恢复正常或按计划进行。
Example: The project is back on track after a few delays. 项目经过几次延误后又回到了正轨。
back up (data): 备份数据。
Example: It's important to back up your data regularly in case of a computer crash. 为了防止计算机崩溃，请务必定期备份数据。
以下是一些额外的学习资源，可以帮助您扩展英语词汇量和提高英语表达能力：
1. on my back 找我麻烦，挑我毛病
Eg: Whenever I come home late, my wife is always on my back. 每当我回家晚了，我妻子就会找我麻烦。
2. get off my back 少跟我啰嗦
eg: I had enough with you. Get off my back. 我受够你了。别再烦我了。
3. turn my back on 拒绝帮助
eg: I can’t turn my back on him when he needs help. 在他需要帮助的时候，我不能不管。
4. behind my back 在背后
eg: If I did refuse to help, my supervisor might say bad things about me behind my back. 如果我真的拒绝帮忙，我的上司会在我背后说我坏话。
5. stab in the back 伤人的暗箭；背叛；诽谤
eg: Such a vicious lie could be nothing but stab in the back. 这样的恶毒谎言简直是背地里向人捅刀子。
6. pat on the back 鼓励；表扬
eg: Sometimes, when I am very productive in my job, my employer gives me a pat on the back. 有时当我工作非常富有成效时，我老板会表扬我。
7. I will scratch your back if you will scratch mine. 礼尚往来
Eg: “I’ll scratch your back if you will scratch mine.” only works if you will respond with something approaching parity.
只有晓得对方会以接近对等的方式回应，“礼尚往来”才行得通。
通过学习和使用这些 "back" 相关的短语和习语，您可以更有效地表达自己的想法和感受，并更好地理解英语母语人士的交流。