double-booking
Refers to the situation where the same resource (e.g., hotel room, flight seat, appointment) is booked for two different parties at the same time. Often used in travel, hospitality, and scheduling contexts.
See also: ダブルブッキング
The hotel had no room because of a double-booking.
We improved the system to prevent double-bookings.
Synonymous loanword from English. ダブルブッキング is more casual and commonly used in everyday conversation, while 二重予約 is slightly more formal and often seen in written or business contexts.
Compound of 二重 (にじゅう, 'double') and 予約 (よやく, 'reservation').