Worst  —adj. Most bad. —adv. Most badly. —n. Worst part or possibility (prepare for the worst). —v. Get the better of; defeat.  at its etc. Worst in the worst state. At worst (or the worst) in the worst possible case. Do your worst expression of defiance. Get the worst of it be defeated. If the worst comes to the worst if the worst happens. [old english: related to *worse]