What is the definition or description of: tranxene (clorazepate) overdose?

Varies with dose: There are degrees, related to how much taken. At slight overdose, these is sleepiness, and perhaps some "drunkenness," with poor judgment, imbalance, slurred speech. At higher doses, sleeping, but temporarily rousable. At higher doses, coma. Although respirations and blood pressure are reduced then, it typically is only lethal when overdosed in combination with something -- especially alcohol.