call back

1. If you call back somebody (or call somebody back) you telephone someone who rang you earlier, or you telephone someone for a second time.
Examples of use:
a) Mr Evans while you were out: he wants you to call him back.
b) He forgot to book a double room, so he had to call the hotel back.
2. To call back is to return to a place to see somebody again.
Examples of use:
a) I’m sorry, Mrs Bottone is in a meeting. Can you call back this afternoon?