take notes

Also, make notes. Record one's observations or what one hears in order to help recall them later. For example, Jim never takes notes in class and I think he'll regret it, or The decorator made notes of window measurements and other dimensions. [Mid-1500s] Also see take note.

The American Heritage® Idioms Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.