redial
verb[IorT]
COMMUNICATIONSuk/ˌriːˈdaɪəl/usto make aphonecallagain to anumberthat you have just called because thelinewasbusytheprevioustime:
Somecallershad to redial as many as 40timesto get through to anoperator.
redial
noun[U]
COMMUNICATIONSuk/ˌriːˈdaɪəl/usafeatureon aphonethatkeepsthe lastnumbercalled initsmemoryso thenumbercan be called again bypressingasinglebutton:
theautomaticredialbutton