Verb
hit the accelerator (third-person singular simple present hits the accelerator, present participle hitting the accelerator, simple past and past participle hit the accelerator)
(idiomatic) Synonym of hit the gas.
I think I don't sing as hard as I used to sing. I used to kind of hit the accelerator a lot back in my youth, but now it's just being able to control it, and not work it so hard and use more of an emotional or sub textual kind of approach to singing. K.d. lang