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set of two (one large, one small); pair (for husband and wife); his and hers (e.g. teacups)
「夫婦」 has another reading with different meanings.
めおと茶碗を結婚祝いに贈った。
I gave a pair of his-and-hers tea bowls as a wedding gift.
結婚祝いに夫婦茶碗を贈りました。
I gave a pair of tea bowls as a gift.
結婚記念日に夫婦で温泉旅行に行きました。
The couple went on a trip.