vt.

1. 使爆裂，使破裂
   The heat cracked my lips.

   我热得嘴唇开裂。

2. 砸开，砰地一声打开；强行进入
   He carefully cracked a nut and then gave it to me.

   他仔细敲开一只坚果，然后递给了我。

3. 使霹啪作响
4. 使嗓音变粗（或变哑）
5. 猛击
   He wanted to crack the rowdy over the head, but refrained.

   他想猛击小流氓的头，可还是忍住了。

6. 【口】说（笑话等）
   They sat by the fire, cracking jokes.

   他们坐在火堆旁讲笑话。

7. 破解（密码），解开（难题等）
   The police cracked the case in one week.

   警察在一周内就侦破了此案。

   She cracked the code.

   她破译了电码。

vi.

1. 发出爆裂声
2. 裂开，爆裂；断裂
   The glass cracked when I poured icy water into it.

   当我把冰水倒进杯子时，杯子裂开了。

3. （嗓音）变粗（变哑）
   Her voice cracked with grief.

   她悲伤得语不成声。

4. 垮掉；屈服[（+up）]

n.[C]

1. 裂缝，裂痕
   There are many cracks in the old wall.

   旧墙上有许多裂缝。

2. 爆裂声
   We heard a crack of thunder.

   我们听见一声霹雳。

3. 猛烈的一击
4. 【口】尝试[S1][（+at）]
   This is my first crack at cooking.

   这是我第一次尝试做饭。

5. 俏皮话[（+about）]
   He's always making cracks about my big feet.

   他老是取笑我的一双大脚。

6. （突然）变声，（嗓音）发哑
7. 瑕疵，缺点
8. 纯可卡因

a.

1. 第一流的，顶呱呱的[B]
   He is a crack baseball player.

   他是个呱呱叫的棒球运动员。

ad.

1. 霹啪一声地

n.

1. a narrow opening between two parts of something which has split or been broken.
2. a sudden sharp or explosive noise.
   ▸a sharp blow.
3. informal a joke or jibe.
4. (also craic) chiefly Irish enjoyable entertainment; a good time.
   ▸Scottish & N. English a conversation.
5. informal an attempt to do something.
6. (also crack cocaine) a potent hard crystalline form of cocaine broken into small pieces.

v.

1. break or cause to break with little or no separation of the parts.
2. give way under pressure or strain.
   ▸ (crack up) informal suffer an emotional breakdown under pressure.
   ▸ (crack up) informal burst into laughter.
3. make or cause to make a sudden sharp or explosive sound.
   ▸hit hard.
4. (of a person's voice) suddenly change in pitch, especially through strain.
5. (crack down on) informal take severe measures against.
6. informal solve, interpret, or decipher.
   ▸break into (a safe).
7. (crack on) Brit. informal proceed or progress quickly.
8. tell (a joke).
9. decompose (hydrocarbons) by heat and pressure to produce lighter hydrocarbons.

adj.