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call up

 
See:
call
part of speech: phrase
definition 1: (informal) to telephone (someone); make a call to.
I called up my aunt last week and we had a long chat.I know she likes you; why don't you call her up?
definition 2: to give the order for (soldiers, guards, or the like) to report for active service.
25,000 troops were called up to quell the disturbance