Darby and JoanDarby and Joan
any old married couple much devoted to each other
Origin of Darby and Joanfrom an 18th-c. song
Darby and Joan
An elderly married couple who live a placid, harmonious life together and are seldom seen apart.
Origin of Darby and JoanProbably after Darby and Joan , a couple in an 18th-century English ballad