a married couple; husband and wife (the two people in a marriage).
彼らは仲の良い夫婦として有名だ。
They are famous as a happily married couple.
結婚してから十年、夫婦の関係は深まった。
Ten years after getting married, their relationship as a couple deepened.
めおとで小さな旅館を経営している友人がいる。
I have friends who run a small inn as a married couple.
used as a prefix meaning a pair (one for him and one for her), e.g. matching items like 'his and hers' cups.
結婚祝いに夫婦茶碗を贈った。
I gave a pair of matching rice bowls as a wedding gift.
新居には夫婦箸と夫婦椅子を揃えた。
In the new home we set out matching chopsticks and chairs for the couple.