on line

on line idiom
  1. See in line, def. 2.
  2. Actively linked to or operating a computer, as in They haven't got the printer on line yet, or Mark's been on line all morning. [Late 1900s] Also see go on, def. 9.

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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