Idiom: 'have one's nose in a book'

[Guest]

Test No. express/inter-4 "Picking you up", question 6

He's always got his nose in a book.

(a) hiding
(b) reading
(c) studying
(d) looking

Test No. express/inter-4 "Picking you up", answer 6

He's always reading.

Correct answer: (b) reading
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i want an explanation for this one and the usage and meaning

[Mister Micawber]

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The idiomatic phrase to have one's nose in a book means to be closely reading the book.
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There is at least one other lexically-related idiom: to have one's nose in another's business / affairs /etc means to be inappropriately preoccupied with another's business, etc.
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Native English teacher at Mister Micawber's

[Alan]

Hi,

Have your nose in a book is often used to describe someone who is always reading and at the same time is absorbed in the activity. You might like to look at another exercise I've done on idioms using other parts of the body:

Expressions, Intermediate Level # 1

Alan
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English as a Second Language
You can read my ESL story Party Conferences