sign off v. i. To terminate a communication, especially one conducted by radio waves; to terminate a broadcast over radio or television; as, this is your reporter in Cairo, signing off.
... stories narrating the exploits of Dr. Bird. I think your November issue is the best one yet. My favorite story so far is "The Gray Plague." I did not like "Beyond the Heaviside Layer." The illustrations are fine. Well, I guess it's about time for me to sign off.—Henry Seitz, 1732 Summerfield ... — Astounding Stories, March, 1931 • Various
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