flu 
/ˈflu:/ noun
/ˈflu:/ noun [noncount] : a common disease that is caused by a virus and that causes fever, weakness, body aches, and breathing problems : influenza
▪ He came down with a bad bout/attack/case of the flu. ▪ catch/get the flu ▪ She has the flu. = (Brit) She has flu. — often used before another noun ▪ the flu season ▪ a flu shot ▪ a flu epidemic
▪ He came down with a bad bout/attack/case of the flu. ▪ catch/get the flu ▪ She has the flu. = (Brit) She has flu. — often used before another noun ▪ the flu season ▪ a flu shot ▪ a flu epidemic
