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We found one dictionary with English definitions that includes the word unbook:
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General (1 matching dictionary)

1. unbook: Wiktionary [home, info]

Quick definitions from Wiktionary (unbook) ▸ verb:  To undo the process of booking; to cancel a booking. ▸ Words similar to unbook ▸ Usage examples for unbook ▸ Idioms related to unbook (New!) ▸ Words that often appear near unbook ▸ Rhymes of unbook ▸ Invented words related to unbook