[noun] [C]There's water on the floor - we must have a leak somewhere.If you suspect a gas leak, phone the emergency number.A leak is also the origin of secret information which becomes known more widely or the act of making it known.There have been several security leaks recently.They traced the leak to a secretary in the finance department.(slang) If you take a leak/(UK and ANZ also) have a leak you urinate.
Meaning of LEAK in English
Cambridge English vocab. Кембриджский английский словарь. 2012