Definitions of dunk:

• noun:   a basketball shot in which the basketball is propelled downward into the basket
• verb:   dip into a liquid while eating

  Example: "She dunked the piece of bread in the sauce"

• verb:   immerse briefly into a liquid so as to wet, coat, or saturate
• verb:   make a dunk shot, in basketball

  Example: "He dunked the ball"

• name:  A surname (very rare: popularity rank in the U.S.: #27758)