call back is a verb meaning "cause to be returned". It carries 4 recorded senses.
cause to be returned
“recall the defective auto tires”
“The manufacturer tried to call back the spoilt yoghurt”
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”
return or repeat a telephone call
“I am busy right now--can you call back in an hour?”
“She left a message but the contractor never called back”
Definitions, synonyms and semantic relations for call back come from Princeton University’s WordNet. Commonness is measured against a corpus of everyday English. Full sources and licences.