BT Šab 33b(32) :הוו יתבי עד צוורי^י^הו בחלא כולי יומא וגרסי‏ : they used to sit (in the cave while covered) up to their necks in sand the entire day and study
See the entire entry for grs vb. to learn or know by heart

BT Šab 33b(32) :הוו יתבי עד צוורי^י^הו בחלא כולי יומא וגרסי‏ : they used to sit (in the cave while covered) up to their necks in sand the entire day and study
See the entire entry for ḥāl, ḥālā n.m. sand

BT Šab 33b(32) :הוו יתבי עד צוורי^י^הו בחלא‏ : they used to sit (in the cave while covered) up to their necks in sand
See the entire entry for ṣwar, ṣawrā n.m. neck