The Collaborative International Dictionary of English v.0.48:

Squint \Squint\, v. i. [imp. & p. p. Squinted; p. pr. & vb. n.
   Squinting.]
   1. To see or look obliquely, asquint, or awry, or with a
      furtive glance.
      [1913 Webster]

            Some can squint when they will.       --Bacon.
      [1913 Webster]

   2. (Med.) To have the axes of the eyes not coincident; to be
      cross-eyed.
      [1913 Webster]

   3. To deviate from a true line; to run obliquely.
      [1913 Webster]

   4. To have an indirect bearing, reference, or implication; to
      have an allusion to, or inclination towards, something.

            Yet if the following sentence means anything, it is
            a squinting toward hypnotism.         --The Forum.
      [Webster 1913 Suppl.]

   5. To look with the eyes partly closed.
      [PJC]