verb-intransitive. 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.verb-intransitive. To give evidence on oath.verb-intransitive. 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.v. 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.v. To put to an oath; to cause to take an oath; to administer an oath to; -- ofetn followed by in or into.v. To declare or charge upon oath.v. To appeal to by an oath.