LIQUID/GAS [I, T] › If a liquid or gas leaks, it comes out of a hole by accident, and if a container leaks, it allows liquid or gas to come out when it should not: Water had leaked all over the floor. The bottle must have leaked because the bag's all wet. SECRETS [T] › If someone leaks secret information, they intentionally tell people about it: Details of the report had been leaked to the press.