vi.

1. 跳水[（+in/off/into/from）]
   He dived into the river to save a drowning child.

   他跳入河中救一個快溺死的小孩。

2. 潛水[（+down/for）]
   The submarine dived.

   潛水艇下潛了。

3. （飛機）俯衝
4. 急劇下降
5. 衝去；撲去；突然消失；突然伸手[Q]
   He dived into his pocket and fished out ten dollars.

   他突然把手伸進衣袋，掏出十塊錢來。

6. 潛心鑽研，探究[（+into）]
   He has been diving into the history of Chinese literature.

   他潛心研究中國文學史。

n.[C]

1. 跳水，潛水，俯衝，急劇下降
   Infant mortality headed into a steep dive.

   嬰兒死亡率開始急劇下降。

2. 衝，撲，突然消失
   The policeman made a dive for the dropped weapon.

   警察撲向掉下的武器。

3. 【口】低級酒館，低級夜總會

v.

1. plunge head first into water with one's arms raised over one's head.
2. go to a deeper level in water.
   ▸swim under water using breathing equipment.
3. plunge steeply downwards through the air.
   ▸move quickly or suddenly in a downward direction or under cover.
   ▸Soccer  deliberately fall when challenged in order to deceive the referee into awarding a foul.
4. (of prices or profits) drop suddenly.

n.

1. an act or instance of diving.
2. informal a disreputable nightclub or bar.