brown Windsor soup en · NOUN
Meanings
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(uncountable) A hearty traditional British meat soup of disputed origin.
"Well," said Grimble, "I expect rather a lot [from Christmas]. Like a brown Windsor soup or at least a fairly brown Windsor soup. And then turkey and everything and Christmas pudding and things and crackers and balloons and all that. And a cake but I've got the cake."
1972, Clement Freud, Grimble at Christmas: