to cover something with very small drops of liquid in order to keep it wet:
The plant has to be misted every day.
mist overphrasal verb
if someone's eyes mist over, they become filled with tears:
His eyes misted over at the memory of his wife.
to mist up
mist upphrasal verb
if a piece of glass mists up, or if something mists it up, it becomes covered with very small drops of water so that you cannot see through it
mist something ↔ up
I can't see where I'm going, with the windows all misted up like this.