Longman Dictionary of Contemporary English - mist

~1 n 1 a light cloud low over the ground that makes it difficult for you to see very far  (We could just see the outline of the house through the mist.)  (- compare fog1 (1)) 2 air that is filled with very small drops of a particular liquid  (a treatment for asthma in the form of an aerosol mist) 3 lost in the mists of time if something such as a fact or secret is lost in the mists of time, no one remembers it because it happened so long ago  (The real reasons for the war are now lost in the mists of time.) ~2 v  to cover something with very small drops of liquid in order to keep it wet  (The plant has to be misted every day.) mist over phr v 1 if someone's eyes mist over, they become filled with tears  (His eyes misted over at the memory of his wife.) 2 to mist up mist up phr v 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  (I can't see where I'm going, the windows have misted up.)