What is a buzz-bomb?

Answer 1

It's the slang name for German V1 and V2 rockets launched over Britain in the final stages of WW2. So named because they had very noisy engines and coud be heard from miles away. Problem was that when the engine cut out and went silent, that was when you had to run for cover as it was then on its descent. So as long as you could hear the engine you were OK, but once it cut out, duck!