BR 681:5(1) :אתרה דהפך אדרה‏ : the shovel which overturns (the grain of) the threshing-floor
See the entire entry for ˀi/eddar, ˀi/eddrā n.m. threshing floor, barn

BR 681:5(1) :ולפם כן קריין לה אתרה דהפך אדרה‏ : therefore they call it אתרה because it overturns the אדרה (i.e. the threshing floor) †
See the entire entry for ˀtr#2 n.m. shovel or winnowing fan