Etymology
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squint (adj.)

1570s, "looking different ways; looking obliquely," shortened form of asquint (adv.). Meaning "looking indirectly" is from 1610s.

squint (v.)

1590s, from squint (adj.). Related: Squinted; squinting.

squint (n.)

"non-coincidence of the optic axes," 1650s, from squint (adj.). Meaning "sidelong glance" is from 1660s.

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Definitions of squint
1
squint (v.)
cross one's eyes as if in strabismus;
The children squinted so as to scare each other
Synonyms: squinch
squint (v.)
be cross-eyed; have a squint or strabismus;
squint (v.)
partly close one's eyes, as when hit by direct blinding light;
The driver squinted as the sun hit his windshield
2
squint (n.)
abnormal alignment of one or both eyes;
Synonyms: strabismus
squint (n.)
the act of squinting; looking with the eyes partly closed;
3
squint (adj.)
(used especially of glances) directed to one side with or as if with doubt or suspicion or envy; "her eyes with their misted askance look"- Elizabeth Bowen;
Synonyms: askance / askant / asquint / squint-eyed / squinty / sidelong
From wordnet.princeton.edu