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double-book

 
 
verb [I or T]

Definition

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.
(Definition of double-book verb from the Cambridge Business English Dictionary © Cambridge University Press)

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