expression
loving couple; happily married couple
Refers to a married couple who are very close and always together, like a pair of mandarin ducks (おしどり). Often used as a compliment or ideal.
あの二人は本当におしどり夫婦だね。
Those two are really a loving couple, aren't they?
おしどり夫婦と呼ばれるように、いつも一緒にいる。
They are always together, just like a happily married couple.
From おしどり (mandarin duck, a symbol of conjugal fidelity) + 夫婦 (married couple). The phrase likens a devoted couple to a pair of mandarin ducks, which are believed to mate for life.