drop out

退出, 退学

例句与用法：

Some old women and men grow bitter with age; the more their teeth drop out, the more biting they get.

有些老太婆与老头子，随着年岁而变得脾气暴戾——牙齿掉得越多，越发咬得入骨。

In any year some of the students on this crash course find the pace too hot for them and drop out before Christmas.

每年都有一些修这门速成课的学生觉得课程负担太重而于圣诞节前辍学的。

He drop out because of the pressure.

由于校规很严，所以他退学了。

The marathon runner raced ahead in the early stages of the race but he had overplayed his hand and had to drop out exhausted with only three miles to go.

这位马拉松赛跑者在比赛的开始阶段跑在前面，但他过高地估计了自己的力量，结果在离终点仅3英里时，跑得筋疲力尽力而不得不退出比赛。

详细释义：

1. 脱离

Luckily, I dropped out before the deal turned sour.

很幸运的, 在交易变坏前我已退出了。

One of my teeth has dropped out.

我的一颗牙齿掉了。

2. 退出; 退学

She dropped out of school to become a waitress.

她退学去当女招待。