Blackout regulations were imposed on 1 September 1939, before the declaration of war. These required that all windows and doors
should be covered at night with suitable material such as heavy curtains, cardboard or paint, to prevent the escape of any glimmer
of light that might aid enemy aircraft. External lights such as street lights were switched off, or dimmed.
'Whacked' means completely exhausted.
Trix was a model railway set.
People sometimes say 'cheerio' as a way of saying goodbye, especially in British English.
Letters to America
December 21st, 1941
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