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I read a definition of the word "squint" in Merriam Webster Dictionaries which was:

of the eyes : not having the visual axes parallel : CROSSED

"Crossed" (or cross-eyed) is in fact a type of a pathological condition relating to eye known as Strabismus or squint-eyed. So I don't think it should really be there as the equivalent of the definition because it is a type of the squint-eyed disease which is broader term and the type is specific.

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  • That's not how it works. The definition of squint is correct; crossed is "a cross-reference immediately following a boldface colon," which "is a synonymous cross-reference. It may stand alone as the only definitional matter for an entry or for a sense or subsense of an entry." (My emphasis) It's something else to look at which may be helpful. However, criticising dictionaries isn't really a part of our purpose.
    – Andrew Leach
    Oct 2, 2019 at 7:20

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Strabismus is the medical term for a permanent misalignment. Strabismus is derived from the Greek for squint.

But, looking down your nose causes the eyes to misalign temporarily. This is also referred to as cross-eyed, or having your eyes crossed.

Squinting is layman's term and hence encompasses more than one phenomenon: Closing one's eyes to get a better view, looking askance, etc.

Just for completeness, saccades are movements of the eye horizontally between fixed points. Nystagmus is a twitching type of involuntary saccade usually due to neurological or extra-occular muscle issues.

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