From 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]
From The Collaborative International Dictionary of English v.0.48:
Squinting \Squint"ing\ (skw[i^]nt"[i^]ng),
a. & n. from Squint, v. -- Squint"ing*ly, adv.
[1913 Webster]