The term 'ONE FOR JUAN' can be solved by two Spanish words: 'UNA' and 'UNO'. UNA is the feminine form of the word for one, while UNO is the masculine form. Both words are used to refer to the number one in Spanish. The phrase 'ONE FOR JUAN' is often used as a way to express solidarity with someone, usually a friend or family member. It is a way of saying that you are there for them and will always support them.