1. The ability to sit through or tolerate something boring.
2. The ability to endure or persist in a task.
[From German Sitzfleisch, from sitzen (to sit) + Fleisch (flesh). Earliest documented use: Before 1930.
Sitzfleisch is a fancy term for what’s commonly known as chair glue: the ability to sit still and get through the task at hand. It’s often the difference between, for example, an aspiring writer and a writer. Sometimes the word is used in the sense of the ability to sit out a problem — ignore it long enough in the hope it will go away.
“Some prominent seats go to those with prominence. Others go to those with Sitzfleisch, like Representative Eliot L. Engel. Every year since 1989, the Bronx Democrat has won a prime spot at the State of the Union Address simply by showing up early and sitting in it.”
Elizabeth Kolbert; An Aisle Seat In the House or the Titanic; The New York Times; Jan 30, 1998.