Darby and Joan
noun/ˌdɑːbi ən ˈdʒəʊn/
/ˌdɑːrbi ən ˈdʒəʊn/
[plural] (British English)- a way of referring to an old couple who are happily marriedWord Originlate 18th cent.: from a poem (1735) in the Gentleman's Magazine, which contained the lines “Old Darby, with Joan by his side … They're never happy asunder.”
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Darby and Joan