the pedal to the metal

[English Learner]

English Language Tests, Intermediate level

ESL/EFL Test #292 "English Slang Idioms (14)", question 6

He decided that he could probably make it to Portland, Oregon in six hours if he drove with the pedal to the ..........

(a) tread
(b) metal
(c) carpet
(d) plastic

English Language Tests, Intermediate level

ESL/EFL Test #292 "English Slang Idioms (14)", answer 6

He decided that he could probably make it to Portland, Oregon in six hours if he drove with the pedal to the metal.

Correct answer: (b) metal
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tread?

[Mister Micawber]

Not 'tread'. Use your DICTIONARY to find the meanings of 'tread'.
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Native English teacher at Mister Micawber's