Definitions:

1. to become clear verb
   • The sky really cleared up.
2. to finish a task completely verb
   • I cleared the accounting up last week.
3. to free the throat by making a rasping sound verb
   • I cleared up my throat before I gave the speech.
4. to make free from confusion or ambiguity verb
   • I hope my explanation clears things ups.

Synonyms:

• clear
• mop up