underbook

From under- +‎ book.

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underbook (third-person singular simple present underbooks, present participle underbooking, simple past and past participle underbooked)

1. (ambitransitive) To fail to book enough of something; not to sell as much of something as is required.

   The concert hall was underbooked for most of the year and failed to make a profit.

• overbook

• unbrooked