To "tamp down" means to adjust a situation or emotion so that it is more manageable or under control. To "tamp down" a reaction means to lessen its intensity or reach. There are different ways that one can "tamp down" a reaction. The most basic way to "tamp down" a reaction is to take a step back and assess the situation. One can then try to find a compromise or solution that will work for everyone involved. Another way to "tamp down" a reaction is to distract yourself from the situation. Sometimes, it is helpful to take a break or step away from the situation.