If you want to keep warm while travelling (to frowst, as the open air school calls it) do not get in with well-bred Englishwomen.
The places are heated but not aired, and the smell is horrid; but they seem to revel in "frowst."
By a subtle law of association, an armchair is also a "frowst."
I was pretty bad myself, but managed to move about all the time, for the frowst in my cabin would have sickened a hippo.
Lying in bed in the morning when there is no First School is a "frowst."