(verb)
to have eyes whose axes are not parallel, such that the eyes point in different directions, altering the direction of the gaze;
e.g. Both of them squint with their right eyes, a condition which they have had since birth.
(noun)
a medical condition in which the eyes are crossed and have axes pointing in different directions, such that their gazes point in different directions;
e.g. She was diagnosed with a squint when she was a small child.
(noun)
an instance of looking at something or someone with partially closed eyes, in order to see them better, as a response to bright light, or as an expression of disdain or envy;
e.g. His face was in a squint when the light was suddenly turned on in the dark room.
(noun)
a slanted opening in the wall of a church, which allows one to view the altar from a side chapel or aisle;
e.g. He peered through the squint in to the altar.
(adjective)
crossed or slanted, not level or straight;
e.g. The shelf was squint due to being installed incorrectly.