put a plug in

put a plug in for (someone or something)

To speak very highly of or enthusiastically endorse someone or something, as a means of marketing, advertising, or professionally recommending them or it. I was really impressed with your work, so I'd be more than happy to put a plug in for you the next time someone asks me for a mechanic. We're willing to pay you a generous fee if you put a plug in for our new product on your radio show tonight.
See also: for, plug, put
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.

put a plug in (for someone or something)

to say something favoring someone or something; to advertise someone or something. I hope that when you are in talking to the manager, you put a plug in for me. I could use some help. While you're there, put in a plug.
See also: plug, put
McGraw-Hill Dictionary of American Idioms and Phrasal Verbs. © 2002 by The McGraw-Hill Companies, Inc.
See also:
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