SamTgJ Ex7:15 :ואטרה דאתפך לנחש‏ :
See the entire entry for hpk vb. to turn around/over

SamTgJ Ex7:15 :ואטרה דאתפך לנחש‏ : the staff that turned into a serpent
See the entire entry for nḥš#6 n.m. serpent