Princeton's WordNet

1. call-back(noun)

   a return call

2. call-back(noun)

   the recall of an employee after a layoff

3. recall, callback(verb)

   a request by the manufacturer of a defective product to return the product (as for replacement or repair)

4. recall, call in, call back, withdraw(verb)

   cause to be returned

   "recall the defective auto tires"; "The manufacturer tried to call back the spoilt yoghurt"

5. remember, retrieve, recall, call back, call up, recollect, think(verb)

   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"

6. call back(verb)

   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"

7. recall, call back(verb)

   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"