send up the river
send (one) up the river
To sentence one to prison; to cause one to go to prison. A federal judge just sent the CEO up the river for 45 years for defrauding millions of customers. The mob boss ordered a hit on the detective who had sent his right-hand man up the river.
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.
send someone up the river
Fig. to send someone to prison. (Underworld. As done by a judge or indirectly by the police.) They tried to send me up the river, but my testimony got me off. I'm gonna send you up the river if it's the last thing I do.
McGraw-Hill Dictionary of American Idioms and Phrasal Verbs. © 2002 by The McGraw-Hill Companies, Inc.