An overseer is someone in charge of a project or a group of workers, whose job is to make sure the work is done properly. They watch, check, and give directions from above. In factories, on farms, and on building sites, that person used to be called the overseer. Though actually, the word carries a hard history: on slave plantations in the American South, the overseer was the man who drove enslaved people and often hurt them. That shadow still sits on the word, so it can feel heavy or old. In ordinary modern English, people more often say supervisor, manager, or site manager. You still meet overseer in history books, in some churches for a person who looks after a group, and in older writing about work.