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English definition of “be up sb's ass”

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be up sb's ass

mainly US offensive
to be driving too close to the car in front of you: I had a sports car up my ass for the first 50 miles.
Translations of “be up sb's ass”
in Chinese (Traditional) 開車緊跟在(某人的)車後…
in Chinese (Simplified) 开车紧跟在(某人的)车后…
(Definition of be up sb's ass from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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