blur

sense 1: become glassy; lose clear vision; "Her eyes glazed over from lack of sleep"
film_over glaze_over blur

sense 2: to make less distinct or clear; "heat haze blurs the hills."
blur

sense 3: make unclear, indistinct, or blurred; "Her remarks confused the debate"
confuse blur obscure

sense 4: make a smudge on; soil by smudging
smear blur smudge smutch

sense 5: make dim or indistinct; "The drug blurs my vision"
blur blear

sense 6: become vague or indistinct; "The distinction between the two theories blurred"
blur dim slur