What it means

1. noun an order to report for military duty
2. verb bring forward for consideration
   “The case was called up in court”
3. verb call to arms
4. verb cause to become available for use, either literally or figuratively
   “clicking on the icon calls up the program”
5. verb get or try to get into communication (with someone) by telephone
   “I tried to call you all night”
6. verb recall knowledge from memory
   “I can't remember saying any such thing”