/ ˈəʊvəsɪə(r); NAmE ˈoʊvərsɪr/ noun
1.
( old-fashioned ) a person whose job is to make sure that other workers do their work
2.
a person or an organization that is responsible for making sure that a system is working as it should
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WORD ORIGIN
late Middle English (also denoting a person appointed to assist the executor of a will): from oversee .