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| a screen or mat covered with a dark material for shielding a camera lens from excess light or glare. |
| the offspring of a zebra and a donkey. |
crack definition
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crack a book definition
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crack a book
Open a book to study or read, as in He passed the exam without cracking a book. This expression employs the verb to crack in the sense of "to open," a slang usage that dates from the early 1700s. [Colloquial; c. 1930]