does " hit the gas"mean "stepped on the gas "?
Meanwhile the motorcade had begun to come unstuck. The battery in the pool car had gone dead, marooning the press in a chaos of yelling Spanish Americans and blocking the cars behind it. Kellerman signaled Greer to hit the gas; the lead cars sped out to Brooks Medical Center.

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You could also say 'floor it'. That's a common expression.

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Yes, it does.  But, "Hit the gas" also implies that they were in a hurry and wanted to go quickly.

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