double-book
verb
double-booked;
double-booking;
double-books
Definition of double-book
1
: to make plans for (someone or something) to be in two different places at the same time
My husband and I are double-booked for/on Friday night.
2
: to promise a room, seat, table, etc., to two different people or groups at the same time
The airline double-booked my seat.