booked up

English

booked up (comparative more booked up, superlative most booked up)

(slang) Well-read on a particular topic.
- 1875, Potter's American Monthly, volumes 4-5, page 359:
  […] and we believe the day is usually the one on which the saint is supposed to have died; but this we cannot affirm, as we are not booked up in Roman sanctology.
(chess, slang) Extremely knowledgeable in a particular opening as a result of intensive study.
- 2022 March 11, Carsten Hansen, “2022 FIDE Grand Prix Belgrade Semifinals Day 2: Rapport Magic”, in Chess‎^[1]:
  This line is not by any stretch of the imagination considered a critical line, but it does take the players out of mainstream theory, where Giri typically is hardcore booked up.
- 2022 July 21, Colin McGourty, “Zagreb GCT 1: Firouzja leads as new chess era begins”, in Chess24‎^[2]:
  Not only that, he managed to get the incredibly well-booked up US-Cuban star out of book on move 8, and then to give checkmate.