Read the dictionary definition of swear. All definitions for this word.
1. have faith or confidence in
1. you can count on me to help you any time
2. Look to your friends for support
3. You can bet on that!
4. Depend on your family in times of crisis
2. utter obscenities or profanities
1. The drunken men were cursing loudly in the street
3. promise solemnly; take an oath
4. to declare or affirm solemnly and formally as true
1. Before God I swear I am innocent
5. make a deposition; declare under oath