on the button

on the button idiom
Exactly right, precisely, as in Her review of the book was right on the button, or We're supposed to be there at six o'clock on the button. This term may come from boxing, where a punch on the button means “a punch on the chin.” [Colloquial; c. 1900] Also see on the dot.

The American Heritage® Dictionary of Idioms by Christine Ammer. Copyright © 2003, 1997 by The Christine Ammer 1992 Trust. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

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