closed book

noun

Definition of closed book

  1. :  something beyond comprehension :  enigma

Examples of closed book in a sentence

  1. <the couple's unorthodox marriage is definitely a closed book to those outside of the relationship>

1913

First Known Use of closed book

1913



Seen and Heard

What made you want to look up closed book? Please tell us where you read or heard it (including the quote, if possible).

WORD OF THE DAY

the art of making engravings on wood

Get Word of the Day daily email!

WORD GAMES

Take a 3-minute break and test your skills!

Name That Thing

Test your visual vocabulary with our 10-question challenge!

TAKE THE QUIZ
SCRABBLE® Sprint

Test Your Knowledge - and learn some interesting things along the way.

TAKE THE QUIZ