The noun leak has 5 senses (first 1 from tagged texts)
1. (1) leak -- (an accidental hole that allows something (fluid or light etc.) to enter or escape; "one of the tires developed a leak")
2. leak -- (soft watery rot in fruits and vegetables caused by fungi)
3. leak, wetting, making water, passing water -- (a euphemism for urination; "he had to take a leak")
4. escape, leak, leakage, outflow -- (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")