Meaning of “run of book” in the English Dictionary

"run of book" in Business English

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run of bookadjective

also run-of-book uk us abbreviation ROB MARKETING

used to describe advertising space in a magazine, newspaper, etc. bought at a rate that does not allow the business buying the space to choose a particular place for their advertisement:

An advertiser decided to turn two run of book pages into an insert.
Could you provide me with the gross rate for a run-of-book ad?

The offer includes one full page four-color ad to be placed run-of-book.

(Definition of “run of book” from the Cambridge Business English Dictionary © Cambridge University Press)