Looking with eyes partially closed, usually to see something more clearly or because of bright light.
From Middle Dutch 'schuinten' or Old Norse origins (uncertain); entered English in the 17th century. May be related to 'asquint' (askew, sideways).
Squinting temporarily improves vision by reducing the light entering your eyes and creating a 'pinhole camera' effect—which is why people have done it for millennia before glasses existed.
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