Darby and Joan
From Longman Dictionary of Contemporary EnglishDarby and JoanDar·by and Joan /ˌdɑːbi ən ˈdʒəʊn $ ˌdɑːrbi ən ˈdʒoʊn/ noun British English → like Darby and JoanOrigin Darby and Joan (1700-1800) The names of a happy long-married couple in an 18th-century poem