A smear, smudge or blot
"The rain left a nasty blur across the windshield that made it hard to see the road ahead."
become glassy; lose clear vision
"Her eyes glazed over from lack of sleep"
make unclear, indistinct, or blurred
"Her remarks confused the debate"
"Their words obnubilate their intentions"
To make indistinct or hazy, to obscure or dim.
"The sudden downpour blurred the streetlights into glowing streaks on the wet pavement."
In a state of doubt or confusion.
"After hours of trying to solve the puzzle, my mind began to blur and I could no longer remember what had just happened."