Definition of throttle noun from the Oxford Advanced Learner's Dictionary

 

throttle

 noun
noun
BrE BrE//ˈθrɒtl//
 
; NAmE NAmE//ˈθrɑːtl//
 
Parts of a car
 
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a device that controls the amount of fuel that goes into the engine of a vehicle, for example the accelerator in a car He drove along at full throttle (= as fast as possible). (figurative) The campaign is continuing to run at full throttle. See related entries: Parts of a car Word Origin late Middle English (as a verb): perhaps a frequentative, from throat; the noun (dating from the mid 16th cent. referring to a person's throat, gullet or windpipe) is perhaps a diminutive of throat, but the history of the word is not clear.
See the Oxford Advanced American Dictionary entry: throttle

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