Definitions of leak:

• noun:   unauthorized (especially deliberate) disclosure of confidential information
• noun:   an accidental hole that allows something (fluid or light etc.) to enter or escape

  Example: "One of the tires developed a leak"

• noun:   a euphemism for urination

  Example: "He had to take a leak"

• noun:   soft watery rot in fruits and vegetables caused by fungi
• noun:   the unwanted discharge of a fluid from some container

  Example: "He had to clean up the leak"

• verb:   have an opening that allows light or substances to enter or go out

  Example: "The container leaked gasoline"

• verb:   enter or escape as through a hole or crack or fissure

  Example: "Water leaked out of the can into the backpack"

• verb:   be leaked

  Example: "The news leaked out despite his secrecy"

• verb:   tell anonymously

  Example: "The news were leaked to the paper"

• name:  A surname (rare: 1 in 33333 families; popularity rank in the U.S.: #4391)