What is the origin of the idiom "stop the rot" and when to use it?

The idiom "stop the rot" likely derives from the literal act of preventing decay or deterioration. In its figurative sense, it emphasizes the need to take immediate action to halt the spread of a decline or negative trend. It is used in various contexts, such as politics, finance, personal relationships, and healthcare, to underscore the urgency of addressing problems early before they worsen. This expression is generally formal or semi-formal and conveys seriousness and urgency.