Longman Dictionary of Contemporary English homepage

leak

2 noun
     
leak2 [countable]
1 a small hole that lets liquid or gas flow into or out of something:
There is a leak in the ceiling.
The boat had sprung a leak (=a hole had appeared in it).
2

a gas/oil/water etc leak

an escape of gas or liquid through a hole in something:
A gas leak caused the explosion.
3 a situation in which secret information is deliberately given to a newspaper, television company etc:
It became evident from the leaks that something important was going on.
4

take/have a leak

informalHBH to get rid of waste liquid from your body [= urinate]

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