Focus on the pronunciation of double-book
English definition of “double-book”
verb [I or T]
› to sell the same room, seat, or share to more than one person: A customer complained that they had double-booked his room. 21.4 million shares were booked as having been bought, but later were found to have been double-booked.
› to agree to be at two meetings or events that happen at the same time: Make sure your diary is handy so you don't double-book.