n.

1. 背脊，背部[C]
   Someone patted me on the back.

   有人在我背上輕輕地拍了一下。

2. 後部[the S][（+of）]
   Grandpa and grandma sat in the back of the car.

   爺爺和奶奶坐在汽車後排的座位上。

3. 後面，背面[the S][（+of）]
4. 椅背[the S] [（+of）]
5. （書報等的）末尾[the S][（+of）]
   There is an appendix at the back of the book.

   該書末尾處有一附錄。

6. （足球等的）後衛；後衛球員[C][U]

ad.

1. 在原處；回原處
   Joan and I walked back to the college.

   我和瓊安步行回到學校。

2. 向後；後退地
   Please go back three steps.

   請退後三步。

3. 以前；追溯
   A few years back you could see nothing but barren land there.

   數年前人們在那兒所能看到的只是荒野。

4. 回覆；還；往回
5. 止住；延緩

a.[Z]

1. 後面的，後部的
   He sat in the back seat of the car.

   他坐在車子後面的座位上。

2. 拖欠的，到期未付的
3. 過去的；過期的
   I bought some back issues of science magazines yesterday.

   昨天我買了幾本過期的科學雜誌。

4. 【語】舌根音的
5. 偏僻的
6. 向後的

vt.

1. 使倒退；使後退
   She backed her car out of the garage.

   她從車庫倒車出來。

2. 支持；援助；贊助
   A lot of my friends backed my plan.

   許多朋友支持我的計畫。

3. （賽馬等）下賭注於；打賭
4. 裱褙；給……加襯裡[（+with）]
5. 背書（支票等）
   John backed the check immediately.

   約翰立即背書這張支票。

vi.

1. 倒退；後退
   On seeing the dog, she backed away.

   一見到狗，她便向後退去。

2. 【海】（風）逆時針轉向

n.

1. the rear surface of the human body from the shoulders to the hips.
   ▸the corresponding upper surface of an animal's body.
   ▸the spine.
   ▸the main structure of a ship's hull or an aircraft's fuselage.
2. the side or part of something away from the spectator or from the direction in which it moves or faces.
   ▸the side or part of an object opposed to the one that is normally seen or used.
   ▸the part of a chair against which the sitter's back rests.
3. a player in a team game who plays in a defensive position behind the forwards.

adv.

1. in the opposite direction from the one that one is facing or travelling towards.
   ▸at a distance away.
   ▸ (also back of) N. Amer. informal behind.
2. so as to return to an earlier or normal position or condition.
3. in or into the past.
4. in return.

v.

1. give material or moral support to.
   ▸bet money on (a person or animal) winning a race or contest.
2. cover the back of (something) for support, protection, or decoration.
3. (especially in popular music) provide musical accompaniment to (a singer or musician).
4. walk or drive backwards.
   ▸(of the wind) change direction anticlockwise around the points of the compass. The opposite of veer¹.
5. (back on/on to) (of a building or other structure) have its back facing or adjacent to.
   ▸lie behind.

adj.

1. of or at the back.
2. in a remote or subsidiary position.
3. from or relating to the past:
   back pay.
4. directed towards the rear or in a reversed course.
5. Phonetics  (of a sound) articulated at the back of the mouth.