An undersheriff is an office derived from ancient English custom and remaining in, among other places, England and Wales and the United States, though performing different functions. ==United States== In American law enforcement, the undersheriff is the person second in charge of a sheriff`s office. In some departments, the title of undersheriff ....
• (n.) A sheriff`s deputy.
a sheriff 's deputy, esp. one on whom the sheriff 's duties devolve when the office is vacant.