1. the time by which something must be finished, submitted, etc. 2. (formerly) a boundary around a military prison beyond which a prisoner could not venture without risk of being shot by the guards.
While it's important to talk with your doctor about the cause of your slurred speech, slurred speech caused by anxiety is not dangerous. It's not a sign that you have something else coming, or that your brain will somehow be inefficient for handling life tasks in the future.
Brain injuries, strokes, injury to mouth, jaw or tongue and muscular disorders are common causes of slurred speech as they impede proper speech development. Medical conditions such as muscular dystrophy, cerebral palsy and myasthenia gravis which weaken muscle control are also possible slurred speech causes.