Cold hard cash is a popular term that refers to physical money or currency. However, there are several synonyms that can be used in place of this phrase. One such synonym is "ready money," which signifies that the funds are immediately available for use. Another term that is commonly used in place of "cold hard cash" is "greenbacks." This phrase originated from the color of the U.S. dollar bill. Other synonyms that are often used include "cash money," "hard currency," "liquid assets," and "cold cash." These terms all refer to physical currency that can be used for transactions or purchases.