Third person singular of blear; to make eyes unclear or dim, often from tears or fatigue.
From 'blear' (to dim or obscure vision) from Middle English, possibly from Old Norse 'blerja' (to smile contemptuously). Related to 'bleary'.
Your vision 'blears' when you're exhausted or emotional—it's that specific moment when tears or tiredness fuzzes your sight, and the world becomes soft and undefined.
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