swearer

intransitive verb swore, sworn, swearing

1. to make a solemn declaration with an appeal to God or to something held sacred for confirmation: to swear on one's honor
2. to make a solemn promise; vow
3. to use profane or obscene language; curse
4. Law to give evidence under oath

transitive verb

1. to declare solemnly in the name of God or of something held sacred
2. to pledge or vow on oath
3. to assert or promise with great conviction or emphasis
4. to take (an oath) by swearing
5. to administer a legal oath to