blur

make a smudge on; soil by smudging

make dim or indistinct

“The fog blurs my vision”

become glassy; lose clear vision

make unclear, indistinct, or blurred

a hazy or indistinct representation

“it happened so fast it was just a blur”

become vague or indistinct

“The distinction between the two theories blurred”

to make less distinct or clear

“The haze blurs the hills”