The Collaborative International Dictionary of English v.0.48:

man and wife \man and wife\ n.
   A man and woman who are married to each other; a married
   couple.
   [WordNet 1.5]

WordNet (r) 3.0 (2006):

man and wife
    n 1: two people who are married to each other; "his second
         marriage was happier than the first"; "a married couple
         without love" [syn: marriage, married couple, man and
         wife]