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mist overand mist up
[for glass] to fog up; [for glass] to develop a coating of water vapor so that one cannot see. The windshield misted over and we could hardly see out. The glass misted up and we had to wipe it off.
mist overor mist up
1. To cover something with fine droplets of water or some other misty substance: The sprinkler automatically mists over the plants in the greenhouse every day. The humid air misted the mirrors up.
2. To become covered with fine droplets of water or some other misty substance; fog up: The cold windshield misted over with our moist breath. I turned on the blower because the car windows had misted up.
3. To become full of tears: As they sang the old songs, my eyes misted over. I mist up whenever I think of home.