have nose in a book
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have (one's) nose in a book
To be reading a book. Often used of people who always seem to be reading. He's had his nose in a book for the entire camping trip. I wish he would take a break and enjoy the scenery. Poor Mary is so shy. She just has her nose in a book wherever she goes.
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.
have one's nose in a book
Fig. to be reading a book; to read books all the time. Bob has his nose in a book every time I see him. His nose is always in a book. He never gets any exercise.
McGraw-Hill Dictionary of American Idioms and Phrasal Verbs. © 2002 by The McGraw-Hill Companies, Inc.