(grammar) A modifier that could apply either to the clause the precedes it or the clause that follows it; an instance of amphiboly.

(obsolete) One who squints; a person with defective vision.

Having eyes that squint; cross-eyed. / Looking obliquely, or asquint; malignant.

(idiomatic) To squint very much, as though one's eyes were directed as many ways as the points of a bag of nails.

While squinting.