vt.

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

   我熱得嘴脣開裂。

2. 砸開，砰地一聲打開；強行進入
   He carefully cracked a nut and then gave it to me.

   他仔細敲開一顆堅果，然後遞給了我。

3. 使霹啪作響
4. 使嗓音變粗（或變啞）
5. 猛擊
   He wanted to crack the rowdy over the head, but refrained.

   他想猛擊小流氓的頭，可還是忍住了。

6. 【口】說（笑話等）
   They sat by the fire, cracking jokes.

   他們坐在火堆旁講笑話。

7. 破解（密碼），解開（難題等）
   The police cracked the case in one week.

   該案警察在一週內就偵破了。

   She cracked the code.

   她破譯了電碼。

vi.

1. 發出爆裂聲
2. 裂開，爆裂；斷裂
   The glass cracked when I poured icy water into it.

   當我把冰水倒進杯子時，杯子裂開了。

3. （嗓音）變粗（變啞）
   Her voice cracked with grief.

   她悲傷得語不成聲。

4. 垮掉；屈服[（+up）]

n.[C]

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

   牆上有許多裂縫。

2. 爆裂聲
   We heard a crack of thunder.

   我們聽見一聲霹靂。

3. 猛烈的一擊
4. 【口】嘗試[S1][（+at）]
   This is my first crack at cooking.

   這是我第一次嘗試做飯菜。

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

   他老是取笑我的一雙大腳。

6. （突然）變聲，（嗓音）發啞
7. 瑕疵，缺點
8. 純古柯鹼

a.

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

   他是個呱呱叫的棒球運動員。

ad.

1. 霹啪一聲地

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.