تردى

تَرَدَّى \ plunge: to move suddenly and violently: The car plunged over the cliff. precipitate: to cause to fall suddenly from a height: The climber slipped and was precipitated down the cliff. \ تَرَدَّى (اِنْحَطَّ، تَدَهْوَرَ)‏ \ deteriorate, degnerate, retrogress.