put in a word
put in a good word (for one)
To recommend someone (for something); to say complimentary things about someone, their performance, or their capabilities. (Can also be structured "put a good word in (for someone.") I heard you're applying for that IT job here; I'll be sure to put in a good word for you. Your former boss put in a good word for you, but we were a little disappointed in your application.