The Collaborative International Dictionary of English v.0.48:

Swarve \Swarve\, v. i. [See Swerve.]
   1. To swerve. [Obs. or Scot.] --Spenser. Jamieson.
      [1913 Webster]

   2. To climb. [Prov. Eng.] --Halliwell.
      [1913 Webster]