Focus on the pronunciation of double
English definition of “double”
/ˈdʌb·əl/ v [I/T] (TWICE)
› to become twice as much or as many, or to make something twice as much or as many: [I] Company profits have doubled in the last year. [T] For four people, just double the recipe (= make twice as much). › If something or someone doubles as something or someone else, that person or thing has a second use or job: [I] The kitchen table doubles as my desk.