A terser agreement is a concise and brief contract between two parties. It is often used in business transactions and legal documents. In this crossword, the solutions 'YEP' and 'IDO' are both three letter words that signify agreement. 'YEP' is an informal way of saying yes, while 'IDO' is a more formal way of saying yes. Together, these two words indicate that both parties have agreed to the terms of the terser agreement.