BT Git 68b(36) :וליקסום מאי דאיכא תותיה‏ : let him divine what is under him
See the entire entry for qsm vb. to divine

BT Git 68b(36) :מאי טע׳ כי חזיתיה לההוא קסמא אחיכת‏ : why did you laugh when you saw that diviner?
See the entire entry for qassām, qassāmā n.m. diviner