失约的英文：
fail to show up for an appointment

参考例句：

Her ex had done it again
她前夫又一次失约了。

Her ex had done it again.
她前夫又一次失约了。

He accepted the invitation, but was later forced to disengage himself
他接受了邀请，但后来被迫失约。

fail是什么意思：
n. 不及格
v. 失败，不及格；破产；缺乏；衰退

If you fail to plan, you plan to fail.
如果你不做计划，那就是在计划着失败。

The download failed.
下载失败。

Intelligent as you are, I suspect you will fail.
尽管你聪明，我还是猜想你会失败。

show是什么意思：
n. 展览会；炫耀；演出；外观；景象；事业
v. 出示；陈列；显示；演出；说明
adj. 用于展览的；戏剧演出的

This is the Show.
这是棒球联合总会。

The shop is showing.
店里在展出商品。

Not for sale will be showing.
非卖品都将展出。

appointment是什么意思：
n. 任命；职位；约会

to cancel an appointment
取消约会

Appointments can be made by arrangement.
约见时间可以商定解决。

He will only see you by appointment.
只有事先约好他才能接见你。