de·cel·er·ate 
/diˈsɛləˌreɪt/ verb
de·cel·er·ates; de·cel·er·at·ed; de·cel·er·at·ing /diˈsɛləˌreɪt/ verb 1 : to move slower : to lose speed [no obj] ▪ He decelerated [=slowed down] as he neared the exit on the highway. ▪ The car slowly decelerated. [+ obj] ▪ decelerate an airplane/automobile — opposite accelerate 2 : to cause (something) to happen more slowly [+ obj] ▪ decelerate soil erosion ▪ decelerate economic growth [no obj] ▪ Economic growth is decelerating. [=happening more slowly]
— de·cel·er·a·tion /diˌsɛləˈreɪʃən/ noun [noncount]
▪ the airplane's deceleration ▪ the deceleration of soil erosion
/diˌsɛləˈreɪʃən/ noun [noncount] ▪ the airplane's deceleration ▪ the deceleration of soil erosion
