Learner's definition of VROOM
[count] informal
: the sound made by the engine of a car, truck, etc., when it is running very fast(汽車、卡車等高速行駛時發出的)嗚嗚聲 —
often used as an interjection to imitate the sound of an engine常用作感歎詞,模仿引擎聲音
— vroom
verb vrooms; vroomed; vrooming [no object]