The phrase "dwell as man and wife" has been used for ages to describe married couples living together. However, to add some variety to your writing, you may opt for some synonyms to replace this cliche. Some of the alternatives you can use include "cohabiting as husband and wife," "living together as a married couple," "residing as partners," "inhabiting as spouses," "coexisting as matrimony mates," and "co-occupying as wedded individuals." Using these synonyms gives your writing a fresh perspective and grabs the reader's attention while keeping the same meaning.