n.

1. 底；底部；下端[C]
   The bottom of the cup is broken.

   這杯子的底破了。

2. 屁股，臀部[C]
3. （海，河的）底部，水底[the S]
4. 最低下的部分，底層[the S]
   The apples at the bottom of the basket are smaller.

   籃子底部的蘋果較小。

5. 遠端，盡頭[the S] [（+of）]
6. 起點；原因[the S] [（+of）]
   We will get to the bottom of the mystery.

   我們將揭開這個謎。

7. （汽車等的）最低檔[U]
8. （兩件一套的衣服的）下件，褲
9. 吃水線以下的船體[C]
10. 低窪地[P]
11. 持久力，耐力[U]

a.[Z]

1. 最低的；最後的，最下的
   The bottom layer is a mixture of sand and clay.

   最下面的一層是沙和泥的混合物。

vt.

1. 在……上裝底
2. 對……尋根究底
   They tried to bottom his motives but failed.

   他們曾想追查他的動機但未成功。

vi.

1. 基於，根據[（+on/upon）]
   Upon what does his claim bottom?

   他提出這一要求的根據是什麼？

2. 到達底部；降至最低點[（+out）]
   The recession has bottomed out.

   經濟衰退已至谷底。

n.

1. the lowest point or part of something.
   ▸the furthest part or point of something.
   ▸ (also bottoms) the lower half of a two-piece garment.
2. chiefly Brit. a person's buttocks.
3. archaic stamina or strength of character.
4. Physics  one of six flavours of quark.

adj.

v.

1. (of a ship) touch the bottom of the sea.
2. (bottom out) (of a situation) reach the lowest point before stabilizing or improving.