verb
1.
change or develop in a general direction.
"unemployment has been trending upwards"
synonyms: move, go, tend, head, drift, gravitate, swing, shift, turn, incline, lean, veer More
(of a topic) be popular or the cause of much discussion on a news or social media website.
"I've just taken a quick look at what's trending on Twitter right now"
2.
(especially of a geographical feature) bend or turn away in a specified direction.
"the Richelieu River trending southward to Lake Champlain"