run sb in
(infml 口) arrest sb and take him to a police station 逮捕某人押送警察局
He was run in for drunk and disorderly behaviour. 他因酗酒滋事而被拘留. run sth in prepare (the engine of a new car) for normal use by driving slowly and carefully 进行(新汽车的发动机的)磨合运转, 磨合试车
Don´t drive your new car too fast until you´ve run it in. 新汽车未经磨合运转不要开得太快.