prep.

1. 在……下面，在……下方；在……里面
   What are you wearing under your coat?

   你外套里面穿什么？

   They were playing chess under the tree.

   他们在树下下棋。

2. 少于；低于；未满
   The truck was traveling under fifty miles per hour.

   那辆卡车以每小时不到五十英里的速度行驶着。

3. （表从属）在……的管理（或统治、领导、监督）之下
   We work under an experienced engineer.

   我们在一位经验丰富的工程师手下工作。

4. 正在……之中；正受到；处于……情况之下
   The plan is still under discussion.

   这个计划尚在讨论中。

5. 根据，按照
   Under the new regulations this is permissible.

   根据新的规章制度，这是可以的。

6. 由于，因为
7. 属于，归入
   What do bats come under?

   蝙蝠归属于哪一类？

ad.

1. 在下面，在下方
   The boat went under.

   那艘船沉下去了。

2. 从属地；服从地
3. 更低，更少，更小
   Applicants for the job must be thirty and under.

   申请这一工作的人年龄须在三十以下。

a.

1. 下面的，下方的
   Tom had a fall and his under lip began to swell up.

   汤姆跌了一跤，下唇开始肿起。

2. 下级的，从属的
3. 更低的，更少的，不足的

prep.

1. extending or directly below.
   ▸below or behind so as to cover or protect.
   ▸planted with.
2. at a lower level, layer, or grade than.
3. expressing submission or subordination.
   ▸as provided for by the rules of; in accordance with.
   ▸used to express grouping or classification.
4. lower than (a specified amount, rate, or norm).
5. undergoing (a process).

adv.

1. extending or directly below something.
2. affected by an anaesthetic; unconscious.