clock·er
noun/ˈklɒkə(r)/
/ˈklɑːkər/
(informal)- (British English) a person who illegally changes a car’s milometer so that the car seems to have travelled fewer miles than it really has
倒拨里程表的人；里程表作弊者 - (North American English) a person who sells illegal drugs, especially cocaine or crack
（可卡因等的）毒品贩子