Read the dictionary definition of dive. All definitions for this word.
1. a steep nose-down descent by an aircraft
2. a headlong plunge into water
3. a cheap disreputable nightclub or dance hall
4. swim under water
1. the children enjoyed diving and looking for shells
5. plunge into water
1. I was afraid to dive from the board into the pool
6. drop steeply
1. the stock market plunged