What does 窓という窓 mean? I found it in this sentence in Harry Potter:
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Repeating the same noun twice as in
NounというNoun here has the meaning of "all" (definition #5 at Daijisen):
"...all of the windows are being shined on by the evening sun and are sparkling red."
Time NounというTime Noun can also emphasize time words, but that's a different usage (definition #4 at Daijisen), e.g.:
"today of all days"