call back in WordNet English dictionary

1. 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"
   remember  retrieve  recall  call back  call up  recollect  think 
   
2. summon to return
   "The ambassador was recalled to his country"; "The company called back many of the workers it had laid off during the recession"
   recall  call back 
   
3. 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"
   call back 
   
4. cause to be returned
   "recall the defective auto tires"; "The manufacturer tried to call back the spoilt yoghurt"
   recall  call in  call back  withdraw 
   

call back in English Wiktionary