au pair
From Longman Dictionary of Contemporary Englishau pairau pair /əʊ ˈpeə $ oʊ ˈper/ noun [countable] FAMILYa young person, usually a woman, who stays with a family in a foreign country to learn the language, and looks after their children for a small wageExamples from the Corpusau pair• The au pair may have a different view of her status in the household than her employers do.Origin au pair (1800-1900) French “on equal terms”