PJ Gen11:7 :איתון כדון וניחות ונערבבא תמן לישנהום‏ : come now let us go down and mix up their language there
See the entire entry for ˁrbb vb. to mix up, confuse

PJ Gen11:7 :דלא ישמעון אינש לישן חבריה‏ : so that people would not understand each other
See the entire entry for šmˁ vb. to hear