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become glassy; lose clear vision;
"Her eyes glazed over from lack of sleep"
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to make less distinct or clear;
"The haze blurs the hills"
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make unclear, indistinct, or blurred;
"Her remarks confused the debate"
"Their words obnubilate their intentions"
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make a smudge on; soil by smudging
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make dim or indistinct;
"The fog blurs my vision"
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become vague or indistinct;
"The distinction between the two theories blurred"