What is the meaning of find out the leak and plug it?

[Nasimsuperb]

What is the meaning of find out the leak and plug it?
Give some examples as well please

[Mister Micawber]

Physical speaking, it means what it says: find the weak place where liquid or another material is falling out of the container and repair it. Metaphorically speaking, it means 'discover how or through whom information is being disseminated and stop it'.
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Native English teacher at Mister Micawber's