The Collaborative International Dictionary of English v.0.48:

Trenchmore \Trench"more\, n.
   A kind of lively dance of a rude, boisterous character. Also,
   music in triple time appropriate to the dance. [Obs.]
   [1913 Webster]

         All the windows in the town dance new trenchmore.
                                                  --Beau. & Fl.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Trenchmore \Trench"more\, v. i.
   To dance the trenchmore. [Obs.] --Marston.
   [1913 Webster] Trench-plow