Cash  —n. 1 money in coins or notes. 2 (also cash down) full payment at the time of purchase. 3 colloq. Wealth. —v. Give or obtain cash for (a note, cheque, etc.).  cash in 1 obtain cash for. 2 colloq. (usu. Foll. By on) profit (from); take advantage (of). Cash up count and check the day's takings. [latin: related to *case2]