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Wiktionary
call up

n. An order to report for military service. vb. 1 To retrieve from personal or computer memory. 2 (context idiomatic English) To call on the telephone. 3 To select e.g. to a sports squad.

WordNet
call up
  1. n. an order to report for military duty

  2. v. bring forward for consideration; "The case was called up in court" [syn: bring forward]

  3. get or try to get into communication (with someone) by telephone; "I tried to call you all night"; "Take two aspirin and call me in the morning" [syn: call, telephone, phone, ring]

  4. recall knowledge from memory; have a recollection; "I can't remember saying any such thing"; "I can't think what her last name was"; "can you remember her phone number?"; "Do you remember that he once loved you?"; "call up memories" [syn: remember, retrieve, recall, call back, recollect, think] [ant: forget]

  5. call to arms; of military personnel [syn: mobilize, mobilise, rally] [ant: demobilize]

Usage examples of "call up".

The seemingly blank walls of the briefing room are in fact fullsized screens that can call up images from every computer bank in the ship.

Well, what happenedwait a minute, let me call up the appropriateah, thereyou can see in this picture that there's another structure, a larger one, under construction here.