means A person who oversees and directs the work of others, holding responsibility for how a task, team, or process is carried out.

from From Medieval Latin supervisor, literally 'one who looks over,' built from Latin super- ('over, above') plus videre ('to see') — the same videre that gives us vision, video, and supervise. The word entered English in the early 1600s meaning simply an overseer or inspector; only later did it settle into its modern workplace sense of the one standing behind you, eyes literally 'over' your shoulder.