plural lead feet
Definition of lead foot
: a tendency to drive excessively fast
I'm not going to lie—I have a lead foot when it comes to driving. For some reason, when I'm out on the open road, I can't help but press a bit harder on the accelerator than I should. Just ask my car—she'll tell you.— Caitlin Moran … this is not your Aunt Bessie's Camry—unless your Aunt Bessie has a lead foot …— Mark Kennedy
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Merriam-Webster unabridged
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Time Traveler for lead foot
The first known use of lead foot was in 1920
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