double-book - definition and synonyms

verb [intransitive/transitive] [often passive] 

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present tense
I/you/we/theydouble-book
he/she/itdouble-books
present participledouble-booking
past tensedouble-booked
past participledouble-booked
  1. to promise the same seat, table, or room to two different people at the same time