The phrase "swears up down" is commonly used to convey a strong belief or affirmation. Its spelling can be a bit tricky as the word "up" is pronounced with an [ʌ] vowel sound while "down" is pronounced with an [aʊ] dipthong sound. The stress is also placed on "up," which can catch people off guard when writing it out. The phrase is often used colloquially, so be prepared for some raised eyebrows if using it in formal writing.
The phrase "swears up and down" is an idiomatic expression used to describe someone's strong and emphatic insistence or affirmation of something. It is often used to convey utmost sincerity and conviction in a statement or claim. This phrase is a colloquialism, predominantly used in informal contexts, particularly in spoken language.
When a person "swears up and down," they are firmly declaring the truth or validity of a statement. This expression implies that the individual is willing to offer their word on a matter, asserting that they are absolutely certain and unwavering in their belief. The inclusion of "up and down" emphasizes that their assertion extends in both directions, further reinforcing the sincerity of their claim.
The phrase can be used in various circumstances, such as to convince others of one's innocence, to attest to the accuracy of a story or event, or to authenticate the reliability of an object or situation. For example, someone might say, "My friend swears up and down that she saw a UFO last night," emphasizing their absolute conviction in their friend's account.
Overall, "swears up and down" is an idiomatic expression that denotes unwavering trust and assurance in the truth or validity of an assertion, typically represented by a person's vehement and earnest affirmation.