To dial a telephone number again, usually a number you just tried to call.
Combination of prefix 're-' (again) and 'dial' (from Latin 'dialis'). The term became common in the 1960s-70s when telephone technology developed memory features.
This word is already becoming an anachronism—kids who've only known smartphones don't really 'dial' anything, they tap, so 'redial' is becoming a ghost word from the rotary phone era.
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