Remember, saving is income minus consumption. It follows that an increase in saving is a decrease in consumption.
Savings provide a reserve in times of uncertainty.
Perhaps that is what happened in the early 1930's. The stock market crash of 1929, bank failures and other events certainly gave people reason to feel the future was uncertain. And yet, there is a paradox here. Let's look back at our example, and compare saving before and after the change in the consumption function. Instead, production has dropped just enough to bring saving back to its original level.