1. To have a direct and significant effect or impact on someone or something, typically a negative one. The economic furor in Europe has already begun redounding upon us in America. It will be unclear for some time whether the financial blockade of the region will redound upon the rebel insurgency in any meaningful way.

2. To recoil back on someone or something, especially in a negative or harmful way. In a horrible vicious circle, the venting of all this anger and frustration redounds upon oneself in the form of debilitating stress and anxiety, which in turn simply ends up yielding more anger and frustration. Our desire to exert our mastery over nature is redounding upon us now as the effects of climate change begin taking their toll.