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Meaning of double-book

dou•ble-book

Pronunciation: (dub'ul book'), [key]
— v.t.
  1. to overbook by accepting more than one reservation for the same hotel room, airplane seat, etc.
  2. to make reservations for (more than one hotel accommodation, seat on a plane, etc.) so as to be certain of obtaining at least one of them.
—v.i.
  1. to make double reservations for passenger space, a hotel room, etc.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.