Noun
1. an accidental hole that allows something (fluid or light etc.) to enter or escape;
"one of the tires developed a leak"2. soft watery rot in fruits and vegetables caused by fungi
3. a euphemism for urination;
"he had to take a leak"4. the unwanted discharge of a fluid from some container;
"they tried to stop the escape of gas from the damaged pipe""he had to clean up the leak"5. unauthorized (especially deliberate) disclosure of confidential information