pay off，读音：英[peɪ ɒf],美[peɪ ɔf]。
vt. ①付清，还清（债务）。
②取得成功。
③贿赂。
④报复。
vi. 得到好结果。
例句：
①He paid off the debt of his friend with the money raised by his writings.
他用稿费的收入偿清了朋友的债务。
②Walter will be paid off for his negligence.
华尔特将因他的失职而受到处罚。
③It has been rather costly to install the machinery, but it should pay off in the long run.
安装这套机械代价很高，但从长远来看它会赚钱的。
pay back，读音：[peɪ bæk]
vt. 偿还；报答。
例句：
①He paid the money back promptly.
他很快就把钱还了。
②I'll pay her back for her hospitality by inviting her to dinner.
我要请她吃饭以回报她的殷勤款待。
1、具体含义不同
pay off的意思是偿还，还清债务。pay back的意思是除了表示偿还，还可以表示报复。
2、使用场合不同
pay off常用于还清债务的语境中，并且暗含有已经还清的意味，偏口语，使用较广。pay back的意思侧重于报复，带有一定的贬义。
例句：
They pay off their credit card debt so they can move on.
他们会付清信用卡债务，以便开始新的生活。
He embarrassed me at the party. I'll pay him back someday.
在晚会上他让我难堪了。总有一天我会报复他的。
扩展资料
词汇解析：
1、pay off
英文发音： [ˈpeɪ ɒf]
中文释义：偿清，还清（债务）;还清欠…的钱
例句：
It would take him the rest of his life to pay off that loan.
他得用余生来还清那笔贷款。
2、pay back
英文发音：[peɪ bæk]
中文释义：偿还;报复;惩罚
例句：
Some day I'll pay you back for this!
总有一天我会为此报复你。
本回答被网友采纳意思有区别。
pay off：vt.付清；还清（债务）；取得成功；贿赂；vi. 得到好结果。
pay back：vt. 偿还；报答。
He taught me to keep ample savings, live below my means, and pay off debts.
他教会我要保留足够的存款，在我的财富所能及范围以下生活，付清借款。
If you need help, get help and get it early -- it will pay off in the long run.
如果您需要帮助，那就获取并早日获取帮助 ? 它将在长期运行中给您回报。
You have to stay consistent with them, but they pay off big rewards.
你必须和它们保持一致，它们会给你巨大的回报。
This year, I am doing even better, and plan to pay off my credit card by summer and car by the end of 2007.
今年，我做得更好，我计划到夏天时能够还清我的信用卡，到2007年底时还清我的车贷。
This worked well enough, until it came time to pay back the loans.
知道偿还资本的时间到来之前，这一手法运行还算不错。
First, card borrowers are starting to pay back less of their outstanding balances each month.
首先，信用卡借款者每月实际偿还的金额不断减少。本回答被网友采纳
而pay off 强调还清。
He paid the money back. 他还钱（不一定还清了）
He paid the money off. 他还清了钱。
看电影学英语，今天玲姐带来的分享是“pay”的相关用法，快来跟玲姐一起学习吧。