society > society and the community > kinship or relationship > marriage or wedlock > divorce or dissolution > dissolve marriage [verb (reflexive)] (2)
transitive. To render (a person or persons) unmarried; to dissolve the marriage of; to divorce. Also reflexive, and occasionally intransitive.
intransitive. Of a couple: to separate at the end of a relationship; to ‘split up’. Occasionally reflexive. colloquial.