The Collaborative International Dictionary of English v.0.48:

Trend \Trend\, v. i. [imp. & p. p. Trended; p. pr. & vb. n.
   Trending.] [OE. trenden to roll or turn about; akin to
   OFries. trind, trund, round, Dan. & Sw. trind, AS. trendel a
   circle, ring, and E. trendle, trundle.]
   To have a particular direction; to run; to stretch; to tend;
   as, the shore of the sea trends to the southwest.
   [1913 Webster]