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English definition of “accelerator”

accelerator

noun     /əkˈseləreɪtər/
[C] something that makes a process happen or makes something progress more quickly: Good companies use technology as an accelerator of momentum. In the postwar period, governments saw co-operatives as an economic accelerator. Accelerators offer you a way to pay off your mortgage sooner by increasing the number or amount of payments.
[S] (also accelerator effect) ECONOMICS the principle that investment increases as demand increases, but by greater amounts
put your foot on the accelerator (also hit the accelerator, step on the accelerator) to make something happen or progress more quickly: This company needs someone who can put their foot on the accelerator with our excellent new products.
take your foot off the accelerator to make something happen or progress more slowly: Insurers are taking their foot off the accelerator in anticipation of a softer market.
(Definition of accelerator noun from the Cambridge Business English Dictionary © Cambridge University Press)
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