Those comments clarify and add, Charlie and jford. I'd like to try recording in BB , Noel.
Come to think of it, in usage, punching in often suggest a very short correction, like a bad note, where time is money.
I overdub all the time. I consider it part of the process, a benefit of multi track recording. Arm a track, put on the headphones so the mike doesn't pick anything up, press play/record, and have at it. From there, options include cut, silence, mix with faders, or turn down the original vocal track and make a new one.