The Collaborative International Dictionary of English v.0.48:

Coarct \Co*arct"\, Coarctate \Co*arc"tate\, v. t. [See
   Coarctate, a.]
   1. To press together; to crowd; to straiten; to confine
      closely. [Obs.] --Bacon.
      [1913 Webster]

   2. To restrain; to confine. [Obs.] --Ayliffe.
      [1913 Webster]