n.[C]

1. 不及格
   a fail in math

   数学不及格

vi.

1. 失败
   Our plan has failed.

   我们的计划失败了。

   He failed in everything he tried.

   他做一切事情都失败了。

2. 不及格
   She failed in the examination.

   她这次考试不及格。

3. 失灵；失去作用
   The engine failed.

   引擎出故障了。

4. （指健康）衰退；变弱；消失
   His hearing is failing.

   他的听觉在衰退。

5. 破产；失去支付能力
   Many small banks failed during the recession.

   许多小银行在经济衰退期破了产。

6. 缺乏，不足；（作物）歉收
   The crops failed for two years running.

   农作物连续两年歉收。

vt.

1. 失败；不能；忘记[Y][+to-v]
   He did very well, but failed to break the record.

   他做得很出色，但未破记录。

2. 没有通过（考试），评定（学生）不及格
   The professor failed almost half of the class.

   该教授给班上几乎一半人评了不及格。

   George failed history last semester.

   乔治上学期历史考试不及格。

3. 使失望；有负于
   His courage failed him.

   他失去了勇气。

   His friends failed him when he needed their help most.

   当他最需要帮助的时候，他的朋友们却辜负了他。

4. 舍弃（候选人等）

v.

1. be unsuccessful in an undertaking.
   ▸be unable to meet the standards set by (a test).
   ▸judge (a candidate in an examination or test) not to have passed.
2. neglect to do something.
   ▸disappoint expectations:

   commuter chaos has failed to materialize.
3. stop working properly.
   ▸become weaker or worse.
   ▸go out of business.
4. desert or let down:
   her nerve failed her.

n.