wrote the book on

Idioms & Phrases

wrote the book on

Knows nearly everything about, as in Ask Dr. Lock; he wrote the book on pediatric cardiology, or I wrote the book on job-hunting; I've been looking for two years. This expression is always put in the past tense. [Colloquial; second half of 1900s]

The American Heritage® Dictionary of Idioms by Christine Ammer.
Copyright © 1997. Published by Houghton Mifflin.
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Wrote the book on is always a great word to know.
So is ninnyhammer. Does it mean:
an arrangement of five objects, as trees, in a square or rectangle, one at each corner and one in the middle.
a fool or simpleton; ninny.
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