squint

directed to one side with or as if with doubt or suspicion or envy

abnormal alignment of one or both eyes

cross one's eyes as if in strabismus

“The children squinted so as to scare each other”

be cross-eyed; have a squint or strabismus

partly close one's eyes, as when hit by direct blinding light

“The driver squinted as the sun hit his windshield”

the act of squinting; looking with the eyes partly closed