One of those weird and wonderful coincidences: today's word is "sitzfleisch" and I am re-reading (after 30 years) Herbert Tarr's novel "The Conversion of Chaplain Cohen", where, at the beginning of chapter 7 I have just come to:

"By the middle of January, with almost a month more still remaining till the end of the course, the men were growing restless. Most of them, veterans of a minimum of seven years of higher education, were weary by now of any additional schooling; their sitzfleisch had clearly been worn to the bone."