Cash down refers to a method of payment that involves paying the full amount upfront, typically in cash. There are several synonyms for this phrase, including "paying upfront," "paying in full," "paying immediately," "paying on the spot," "paying in cash," and "paying in advance." These terms are often used interchangeably to describe a transaction where the buyer is required to submit payment upfront, often before the product or service has been provided. While paying cash down can be a convenient way to complete a transaction quickly and efficiently, it is important to ensure that all terms and conditions have been agreed upon and documented before handing over any money.