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Meaning of out of book | Babel Free

Noun CEFR C1

Definitions

No longer following commonly played theoretical lines analyzed in opening books; in territory unfamiliar to one or both of the players.

CEFR level

C1

Advanced
This word is part of the CEFR C1 vocabulary — advanced level.

See also

out of both sides of one's mouth out of bounds out of breath out of central casting out of character out of collar