she has a (convergent) squint or she looks asquint
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The synonyms for squint include looking askance, looking
cross-eyed and peek. It is typically used to mean when someone
narrows their eyes at something to see it better, or has a medical
affliction that affects their eyes.
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Squint eyed
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cross-eyed, squint-eyed, skew-eyed; aperson can be called a
squinter