(v. t.) To put to an oath; to cause to take an oath; to administer an oath to; - ofetn followed by in or into; as, to swear witnesses; to swear a jury; to swear in an officer; he was sworn into office.

(2):

(v. t.) To declare or charge upon oath; as, he swore treason against his friend.

(3):

(v. t.) To appeal to by an oath.

(4):

(v. t.) To utter or affirm with a solemn appeal to God for the truth of the declaration; to make (a promise, threat, or resolve) under oath.

(5):

(v. i.) To give evidence on oath; as, to swear to the truth of a statement; he swore against the prisoner.

(6):

(v. i.) To affirm or utter a solemn declaration, with an appeal to God for the truth of what is affirmed; to make a promise, threat, or resolve on oath; also, to affirm solemnly by some sacred object, or one regarded as sacred, as the Bible, the Koran, etc.

(7):

(v. i.) To make an appeal to God in an irreverant manner; to use the name of God or sacred things profanely; to call upon God in imprecation; to curse.

Bibliography Information
Webster, Noah. Entry for 'Swear'. Noah Webster's American Dictionary. https://www.studylight.org/dictionaries/eng/web/s/swear.html. 1828.

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Swear