/ ˌdiːˈseləreɪt; NAmE / verb ( formal )
1.
[ v , vn ] to reduce the speed at which a vehicle is travelling
2.
to become or make sth become slower
SYN slow down :
[ v ]
Economic growth decelerated sharply in June.
[also vn ]
OPP accelerate
► de·cel·er·ation / ˌdiːseləˈreɪʃn; NAmE / noun [ U ]
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WORD ORIGIN
late 19th cent.: from de- (expressing removal) + a shortened form of accelerate .