Meaning of “double-book” in the English Dictionary

"double-book" in English

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double-bookverb [ I, T often passive ]

uk /ˌdʌb.əlˈbʊk/ us /ˌdʌb.əlˈbʊk/

to promise the same room, seat, ticket, etc. to more than one person or group:

The room was double-booked so they had to give us a different one.

(Definition of “double-book” from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)

"double-book" in Business English

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double-bookverb [ I or T ]

uk us

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” from the Cambridge Business English Dictionary © Cambridge University Press)