run in
1. run someone in把某人扭送警察局;抓起来；拘留，拘捕; 逮捕某人，把某人交给警察
To run someone in means to arrest them or to take them to the police.
to arrest sb and take them to a police station
Kenworthy had run him in on a petty charge.
肯沃西以一项微不足道的指控为由将他拘捕了。
Come on, big boy, head for home before I run you in loitering.
喂，大个子，赶快回家去，不然的话，我就因你在这里游荡而把你抓起来。
Well, officer, are you going to run me in or not?
好了，长官，你是否想把我逮捕归案？
He was run in for theft.
他因为偷窃被逮捕。
If only I had a witness here, I'd run you in.
如果我这里有证人的话，我就让你蹲监狱。
He was run in for being in possession of drugs.
他因持有毒品而被抓了起来。
The police ran him in for driving when drunk.
警察把他抓了起来，因为他酒醉开车。
You’ve no cause to run me in, I’ve done nothing.
你没有理由抓我，我什么都没有做。
The police ran the two drunks in for causing a disturbance in the street.
那两个醉汉因在街道上闹乱子而被警察抓了起来。
2.run sth in 磨合运转，磨合驾驶
to prepare the engine of a new car for normal use by driving slowly and carefully
Whatever system you choose, it must be run in properly.
不管你选择什么样的体系，都必须经过适当的磨合。
I'm running my new car in.
我正在试开我的新车。