0 to promise the same room, seat, ticket, etc. to more than one person or group: --
The room was double-booked so they had to give us a different one.
1 to sell the same room, seat, or share to more than one person: --
A customer complained that they had double-booked his room.
21.4 million shares were booked as having been bought, but later were found to have been double-booked.
2 to agree to be at two meetings or events that happen at the same time: --
We can complete it step by step however long the road is and it can't be completed however short the road is if you don't even mark your footprint.
Можем да го завършим стъпка по стъпка, колкото и дълъг да е пътят и не може да бъде завършен, колкото и кратък да е пътят, ако дори не маркирате отпечатъка си.