shuckle
To sway back and forth during Jewish prayer.
Jewish students and rabbis don't get enough exercise. Therefore, they shuckle when they study and pray in order to get some badly needed exercise!
Where it comes from
From Yiddish שאָקלען (shoklen). Ultimately from Proto-Germanic *skukkijaną.
Adapted from the Wiktionary entry shuckle (CC BY-SA 4.0).