buck the trend
To develop in an unexpected, surprising, or unforeseen way, especially in a way that contradicts recent history. Typically used in reference to financial matters. Although property values in our city are down overall, one neighborhood is bucking the trend and still getting fair market value.
on trend
Adhering to what is currently trendy or fashionable. Ooh, that design is so on-trend—I love it!
trend toward something
to move gradually toward something. Fashions are trending toward the gaudy and flamboyant. Attitudes are trending toward the more conservative.