Etymology
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au pair (n.)

1897 of the arrangement, 1960 of the girl; French, literally "on an equal footing" (see au + pair (n.)).

updated on March 01, 2017

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Definitions of au pair from WordNet

au pair (n.)
a young foreigner who lives with a family in return for doing light housework;
From wordnet.princeton.edu, not affiliated with etymonline.