What is 'lip-flap' in reality TV editing?

What is 'lip-flap' in reality TV editing?

Richard Hall (Reality TV Producer) gives expert video advice on: How are 'reaction shots' used in reality TV editing?; What is a 'story arc'? and more...

Lip-flap means you've taken away the audio because you've got the audio that you wanted. Then there was something that they were saying that you didn't necessarily want to hear or that was going to confuse you, but the picture's still moving. So you still see the lip move without any audio, and you want to avoid that.