The term 'down with the flu, say' can be broken down into three crossword solutions: ILL (3 letters), SICK (4 letters), and ACHY (4 letters). ILL is an adjective used to describe someone who is unwell or in poor health. SICK is another adjective used to describe someone who is unwell, but it can also be used as a verb to mean to make someone feel nauseous. ACHY is an adjective used to describe a feeling of soreness or pain in the body. All three words are commonly used to describe someone who has the flu.