The word "cash" means, in Spanish, "immediate money", i.e. instant money payment, which is known in English as "cash". In Spanish there are other synonyms that are used in different geographical areas, such as "A tocateja" , (In Madrid and in the Manchega area), O "Trinco trinco" , in Andalusia and Murcia. Or, the expression "contante and sound" , in the north and in the rest of Spain. Or the verb "chutar" is used in slang.
