Where does “blurre” come from?

blurre (English) comes from English blear, from Middle English bleren, from Old English blǣran.

Ancestry of “blurre”, step by step

Step	Language	Word	Meaning
1	English	blear	Dim, unclear from water or rheum; Causing or...
2	Middle English	bleren	—
3	Old English	blǣran	—

blurre — Etymology, Origin & Word History | Etymology Explorer