The definition of a call-up is an order to serve in the armed forces.noun
When you receive a notice requiring you to report for active military duty, this is an example of a call-up.YourDictionary definition and usage example. Copyright © 2013 by LoveToKnow Corp.
Used by arrangement with John Wiley & Sons, Inc.
call-up - Phrases/Idioms
Summon to military service, as in He was called up for active duty. [Late 1600s]
Cause to remember, bring to mind, as in These stories call up old times. [c. 1700] Also see call to mind.
Telephone someone, as in I'll call up the theater and find out about tickets. [Late 1800s]
Retrieve data from a computer memory, as in I asked him to call up the last quarter's sales figures. [Second half of 1900s]