Meaning of book up | Babel Free

Definitions

1. To reserve or book all of something, for example by purchasing all the tickets.
   transitive
2. To have all of its tickets or reservations purchased.
   intransitive
3. To study opening lines in great detail in order to gain an advantage.
   slang
4. To study or learn (something).
   slang, transitive

Examples

“Flights are beginning to book up as people flee⟳ the region.”

“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 on some old theory!”

CEFR level