(transitive) To reserve or book all of something, for example by purchasing all the tickets.
Flights are beginning to book up as people flee the region.
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(chess, slang) To study opening lines in great detail in order to gain an advantage.
Flights are beginning to book up as people flee the region.
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(intransitive) To have all of its tickets or reservations purchased.
There would be more extraordinary clock goings on in the big game of the day, Aronian-Firouzja, which began by giving a partial answer to the question of what Alireza Firouzja had been doing for the last five months. He’d been booking up…
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