chastity belt
noun [ C ] uk/ˈtʃæs.tə.ti ˌbelt/ us/ˈtʃæs.tə.t̬i ˌbelt/
（旧时强迫妇女戴在两腿间的）贞节带
a device that some women were forced to wear in the past to prevent them from having sex. It had a part that went between the woman's legs and a lock so that it could not be removed.