Darby and Joan
/ˈdɑːbɪ/noun
- often humorous, chiefly Brit. a devoted old married couple, living in placid domestic harmony〈常幽默, 主英〉恩爱的老夫妇。
词源
late 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. '