Merriam-Webster's Collegiate® Dictionary, 11th Edition
SQUINT
I. adjective
Etymology: Middle English asquint
Date: 1579
looking or tending to look obliquely or askance (as with envy or disdain), not having the visual axes parallel ; crossed,
II. verb
Date: 1599
intransitive verb
1. to have an indirect bearing, reference, or aim, to deviate from a true line,
2. to look in a squint-eyed manner, to be cross-eyed, to look or peer with eyes partly closed, transitive verb to cause (an eye) to squint, squinter noun squintingly adverb
III. noun
Date: circa 1652
strabismus , an instance of squinting, hagioscope , squinty adjective