CLEAR UP

v. 1. To make plain or clear; explain; solve. The teacher cleared up the harder parts of the story. Maybe we can clear up your problem. 2. To become clear. The weather cleared up after the storm. 3. To cure. The pills cleared up his stomach trouble. 4. To put back into a normal, proper, or healthy state. The doctor can give you something to clear up your skin. Susan cleared up the room. 5. To become cured. This skin trouble will clear up in a day or two.