Tire out Definition 1 of 1Pro Tip 1/3Physical Activities Often used after physical exertion, like sports or exercise. Running the marathon really tired me out. Pro Tip 2/3Emotional Impact Can describe mental fatigue due to stress or emotional events. Worrying about the exam all week has tired me out. Pro Tip 3/3Parenting Context Commonly used by parents describing their children's energy levels. It takes a lot to tire out my kids; they have so much energy.