• The Grand was double-booked and had to offer us the first week at another hotel, which was, in our opinion, inferior.
• There's a problem over a double booking.
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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.
Make sure your diary is handy so you don't double-book.