1570s, "looking different ways; looking obliquely," shortened form of asquint (adv.). Meaning "looking indirectly" is from 1610s.
1590s, from squint (adj.). Related: Squinted; squinting.
"non-coincidence of the optic axes," 1650s, from squint (adj.). Meaning "sidelong glance" is from 1660s.
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