"Trump up" is a colloquial expression that means to fabricate or invent something that is not true or to exaggerate a situation in order to falsely accuse someone of a crime. There are many synonyms for this term, including concoct, contrive, manufacture, forge, distort, embellish, inflate, aggrandize, magnify, and embroider. All these words convey the notion of creating something out of thin air or twisting a fact to one's advantage. It is essential to use the appropriate synonym to convey the desired meaning accurately and concisely. Using any of these synonyms will enhance your writing and make your language more expressive and memorable.