concern in

concern (someone) in (something)

To involve someone in something. You really don't need to concern your mother in our financial issues—we're perfectly capable of sorting them out on our own.
See also: concern
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.

concern someone in something

to bring someone into some matter; to engage someone in something; to occupy someone with something. Don't concern Dave in our party planning. He doesn't know anything about entertaining. The wrong committee was concerned in this from the very beginning.
See also: concern
McGraw-Hill Dictionary of American Idioms and Phrasal Verbs. © 2002 by The McGraw-Hill Companies, Inc.
See also:
References in classic literature ?
"The ferry system between Oakland and San Francisco is the worst one-horse concern in the United States.