Their unusual relationship started over doctor visits but quickly turned personal.

For a while after his departure the relationship between the companies turned sour.

At a point when their relationship is already turning difficult, the plot sets in.

Their relationship turns sexual, and Joe ends up becoming her kept man.

The relationship between mother and son turned sour with the years.

However, the relationship between the two women quickly turned sour.

The police were called frequently as the relationship turned violent.

Last night their relationship really had turned a corner.

The relationship between the two soon turned cold, however.

Sometimes, as that exchange suggests, the relationship can turn ugly.