sign on

sign on idiom
  1. Enlist oneself as an employee, as in Arthur decided to sign on with the new software company. [Late 1800s]
  2. Begin radio or television broadcasting, especially at the beginning of the day, as in What time does the station sign on? [c. 1920]

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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