dive in WordNet English dictionary

1. a steep nose-down descent by an aircraft
   dive  nose dive  nosedive 
   
2. a headlong plunge into water
   dive  diving 
   
3. a cheap disreputable nightclub or dance hall
   honkytonk  dive 
   

1. drop steeply
   "the stock market plunged"
   dive  plunge  plunk 
   
2. swim under water
   "the children enjoyed diving and looking for shells"
   dive 
   
3. plunge into water
   "I was afraid to dive from the board into the pool"
   dive