redialverb [ I or T ]
uk/ˌriːˈdaɪəl/usCOMMUNICATIONSto make a phone call again to a number that you have just called because the line was busy the previous time :
Some callers had to redial as many as 40 times to get through to an operator.
redialnoun [ U ]
uk/ˌriːˈdaɪəl/usCOMMUNICATIONSa feature on a phone that keeps the last number called in its memory so the number can be called again by pressing a single button:
the automatic redial button