What is "sign off"?
The phrasal verb "sign off" here is being used to mean conclude something. Usually it is used when talking about a letter, broadcast, or other message. As said here in the clip it was a "final message" to conclude the end of the "Whole Earth Catalogue". Ex: I will sign off here. Have a great day everyone. Ex: He always signs off his emails like that. Ex: Yesterday the news announcer signed off with a warning.
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