The term STAND BUY can be broken down into three crossword solutions: ADE (3 letters), LEMONADE (8 letters), and MAG (3 letters). ADE is a suffix that is commonly used TO form nouns, adjectives, and adverbs. It is derived from the Latin word 'AD', which means 'TO'. LEMONADE is a popular beverage made from lemon juice, water, and sugar. Finally, MAG is an abbreviation for the word 'MAGAZINE', which is a periodical publication containing articles, stories, pictures, and other features.